The study deals with the distribution pattern and morphology of stomata and cystoliths in the lea... more The study deals with the distribution pattern and morphology of stomata and cystoliths in the leaves of six taxa of the genus Ficus of the family Moraceae in Arunachal Pradesh. All the plant species studied contained stomata and cystoliths, which vary in shape and size. Actinocytic stomata type was present in only one species (Ficus sp. 1). Anomocytic type in three, and paracytic in four species. Stomatal frequency calculation revealed that the highest frequency was reported in F. hispida and the lowest in F. rumphii. There is also an indication that semi-coriaceous and coriaceous glabrous leaved species of Ficus are linked to the stomatal characters. The results have shown the presence of stalks in all the cystoliths of various sizes. Different shapes such as star-shaped, bean-shaped, solitary, round, and oblong cystoliths are recorded during the study. The largest cystoliths were found in F. rumphii, where its spinous surface is quite distinct from all other species and can be rec...
Jhum agriculture is widely practiced on Arunachal Pradesh’s hill slopes, and it is more than just... more Jhum agriculture is widely practiced on Arunachal Pradesh’s hill slopes, and it is more than just a means of subsistence; it is a way of life that has symbolic connotations for the socio-cultural life and natural landscapes, and it is an essential component of survival and economic existence. An attempt was made to study the soil characterization associated with pre-and post- burned jhum cultivation practiced by the ethnic Nocte and Tutsa tribes of Tirap district, Arunachal Pradesh. The soil samples were collected from the same location at the pre-and post-burnt fields from the various depth of soil profile A (0-20) cm, B (20-40) cm, and C (40-60) cm. The present study reveals an overall increase in porosity, temp, pH, Moisture, and bulk density because of the burning of the jhum field. In post-burned jhum fields of all the locations, there was an overall increase in the percentage of Sodium and Calcium in soil collected and a decrease in the percentage of Nitrogen, Phosphorus, and ...
Increasing human population and various developmental activities in the Indian state of Arunachal... more Increasing human population and various developmental activities in the Indian state of Arunachal Pradesh, which lies in one of the most bio-diverse regions of the world, has caused large-scale deforestation, pushing a large number of native tree species to the serious verge of elimination from their native forest. In such tribal-dominated landscapes around the world, myriads of studies have emphasized the potential of homegardens as a site for local biodiversity conservation as they are known to have a huge Indigenous Knowledge System (IKS) on the use of diverse native floras. The present study was, therefore, undertaken to investigate if the native communities of the Mishmi tribe conserved native indigenous tree species in their homegardens and if they are grown then what is the future of these tree species? It was hypothesized that harbouring greater indigenous knowledge implies greater domestication of tree species in their homegardens. Altogether, 103 species of trees were reco...
The genus Chlorophytum Ker Gawler (1808: 1071) (Asparagaceae), includes about 200 species (Govaer... more The genus Chlorophytum Ker Gawler (1808: 1071) (Asparagaceae), includes about 200 species (Govaerts et al. 2012) distributed in the Old World tropics (Mabberley 2017). In India, this genus is represented by 19 species (Malpure & Yadav 2009; Chandore et al. 2012), including the new species proposed below. Indian species of Chlorophytum are usually forest dwellers and are cryptophytic with aboveground organs disappearing in the dry season (Chandore et al. 2012). Most of the members of Chlorophytum, reported from India have their distribution in Western Ghats except C. nepalense (Lindley 1826: 277) Baker (1876: 320), C. comosum (Thunberg 1794: 63) Jacques (1862: 345), C. breviscapum Dalzell (1850: 141), and C. arundinaceum Baker (1876: 323) growing in northeastern Himalaya (Adsul 2015).
Blumea - Biodiversity, Evolution and Biogeography of Plants, 2020
Peliosanthes macrophylla var. assamensis, a new variety from Behali Reserve Forest in Assam, Nort... more Peliosanthes macrophylla var. assamensis, a new variety from Behali Reserve Forest in Assam, Northeast India, is described with accompanying photos and relevant taxonomic data. It differs from var. macrophylla from Arunachal Pradesh and Sikkim, Northeast India, mainly by the staminal corona internally protruding near the middle (vs internally upright corona without a particular inward protrusion), shorter anthers somewhat divergent distally (vs nearly upright anthers), and longer, papillulate pistils exceeding the anthers (vs glabrous pistils not exceeding the anthers).
Aristolochia assamica D. Borah & T.V. Do (Aristolochiaceae), a new species from the East Hima... more Aristolochia assamica D. Borah & T.V. Do (Aristolochiaceae), a new species from the East Himalayas (NE India) is described and illustrated. It has purplish to greenish terete stems, brownish ovate-lanceolate bracteoles with a short stalk at base and acuminate apex, cymes with 2–15 flowers, fasciculate, on extremely short inflorescence axes, a sessile utricle, creamy-white to greenish-yellow perianth with a brownish patch on its throat, a 1-lobed limb, oblong linear with a twisted cauda, and a 6-lobed gynostemium. According to these morphological characteristics, A. assamica should be placed in Aristolochia subgenus Aristolochia series Aristolochia. A detailed description, phenology, distribution and ecology as well as comparison with four morphologically closely similar species is presented. In addition, a key to the Indian species of Aristolochia subgenus Aristolochia section Aristolochia is provided.
An interesting specimen of Lobelia L. collected from the lateritic plateau of northern Kerala, In... more An interesting specimen of Lobelia L. collected from the lateritic plateau of northern Kerala, India is described and illustrated as a new species, Lobelia lammersiana. This rare species grows in the marshy area around the ponds on the lateritic plateau. The new species shows similarities to Lobelia alsinoides Lam. in the trichomes at the apex of stamens and in the characters of calyx lobes, fruit and seed, but differs in having terete stem, minute leaves, subequal corolla lobes and a quadrangular style.
The study deals with the distribution pattern and morphology of stomata and cystoliths in the lea... more The study deals with the distribution pattern and morphology of stomata and cystoliths in the leaves of six taxa of the genus Ficus of the family Moraceae in Arunachal Pradesh. All the plant species studied contained stomata and cystoliths, which vary in shape and size. Actinocytic stomata type was present in only one species (Ficus sp. 1). Anomocytic type in three, and paracytic in four species. Stomatal frequency calculation revealed that the highest frequency was reported in F. hispida and the lowest in F. rumphii. There is also an indication that semi-coriaceous and coriaceous glabrous leaved species of Ficus are linked to the stomatal characters. The results have shown the presence of stalks in all the cystoliths of various sizes. Different shapes such as star-shaped, bean-shaped, solitary, round, and oblong cystoliths are recorded during the study. The largest cystoliths were found in F. rumphii, where its spinous surface is quite distinct from all other species and can be rec...
Jhum agriculture is widely practiced on Arunachal Pradesh’s hill slopes, and it is more than just... more Jhum agriculture is widely practiced on Arunachal Pradesh’s hill slopes, and it is more than just a means of subsistence; it is a way of life that has symbolic connotations for the socio-cultural life and natural landscapes, and it is an essential component of survival and economic existence. An attempt was made to study the soil characterization associated with pre-and post- burned jhum cultivation practiced by the ethnic Nocte and Tutsa tribes of Tirap district, Arunachal Pradesh. The soil samples were collected from the same location at the pre-and post-burnt fields from the various depth of soil profile A (0-20) cm, B (20-40) cm, and C (40-60) cm. The present study reveals an overall increase in porosity, temp, pH, Moisture, and bulk density because of the burning of the jhum field. In post-burned jhum fields of all the locations, there was an overall increase in the percentage of Sodium and Calcium in soil collected and a decrease in the percentage of Nitrogen, Phosphorus, and ...
Increasing human population and various developmental activities in the Indian state of Arunachal... more Increasing human population and various developmental activities in the Indian state of Arunachal Pradesh, which lies in one of the most bio-diverse regions of the world, has caused large-scale deforestation, pushing a large number of native tree species to the serious verge of elimination from their native forest. In such tribal-dominated landscapes around the world, myriads of studies have emphasized the potential of homegardens as a site for local biodiversity conservation as they are known to have a huge Indigenous Knowledge System (IKS) on the use of diverse native floras. The present study was, therefore, undertaken to investigate if the native communities of the Mishmi tribe conserved native indigenous tree species in their homegardens and if they are grown then what is the future of these tree species? It was hypothesized that harbouring greater indigenous knowledge implies greater domestication of tree species in their homegardens. Altogether, 103 species of trees were reco...
The genus Chlorophytum Ker Gawler (1808: 1071) (Asparagaceae), includes about 200 species (Govaer... more The genus Chlorophytum Ker Gawler (1808: 1071) (Asparagaceae), includes about 200 species (Govaerts et al. 2012) distributed in the Old World tropics (Mabberley 2017). In India, this genus is represented by 19 species (Malpure & Yadav 2009; Chandore et al. 2012), including the new species proposed below. Indian species of Chlorophytum are usually forest dwellers and are cryptophytic with aboveground organs disappearing in the dry season (Chandore et al. 2012). Most of the members of Chlorophytum, reported from India have their distribution in Western Ghats except C. nepalense (Lindley 1826: 277) Baker (1876: 320), C. comosum (Thunberg 1794: 63) Jacques (1862: 345), C. breviscapum Dalzell (1850: 141), and C. arundinaceum Baker (1876: 323) growing in northeastern Himalaya (Adsul 2015).
Blumea - Biodiversity, Evolution and Biogeography of Plants, 2020
Peliosanthes macrophylla var. assamensis, a new variety from Behali Reserve Forest in Assam, Nort... more Peliosanthes macrophylla var. assamensis, a new variety from Behali Reserve Forest in Assam, Northeast India, is described with accompanying photos and relevant taxonomic data. It differs from var. macrophylla from Arunachal Pradesh and Sikkim, Northeast India, mainly by the staminal corona internally protruding near the middle (vs internally upright corona without a particular inward protrusion), shorter anthers somewhat divergent distally (vs nearly upright anthers), and longer, papillulate pistils exceeding the anthers (vs glabrous pistils not exceeding the anthers).
Aristolochia assamica D. Borah & T.V. Do (Aristolochiaceae), a new species from the East Hima... more Aristolochia assamica D. Borah & T.V. Do (Aristolochiaceae), a new species from the East Himalayas (NE India) is described and illustrated. It has purplish to greenish terete stems, brownish ovate-lanceolate bracteoles with a short stalk at base and acuminate apex, cymes with 2–15 flowers, fasciculate, on extremely short inflorescence axes, a sessile utricle, creamy-white to greenish-yellow perianth with a brownish patch on its throat, a 1-lobed limb, oblong linear with a twisted cauda, and a 6-lobed gynostemium. According to these morphological characteristics, A. assamica should be placed in Aristolochia subgenus Aristolochia series Aristolochia. A detailed description, phenology, distribution and ecology as well as comparison with four morphologically closely similar species is presented. In addition, a key to the Indian species of Aristolochia subgenus Aristolochia section Aristolochia is provided.
An interesting specimen of Lobelia L. collected from the lateritic plateau of northern Kerala, In... more An interesting specimen of Lobelia L. collected from the lateritic plateau of northern Kerala, India is described and illustrated as a new species, Lobelia lammersiana. This rare species grows in the marshy area around the ponds on the lateritic plateau. The new species shows similarities to Lobelia alsinoides Lam. in the trichomes at the apex of stamens and in the characters of calyx lobes, fruit and seed, but differs in having terete stem, minute leaves, subequal corolla lobes and a quadrangular style.
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