Research Article |
Corresponding author: Arun K. Pandey ( arunpandey79@gmail.com ) Academic editor: Patrick Herendeen
© 2016 Akram Gholami, Arun K. Pandey.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Gholami A, Pandey AK (2016) Alysicarpus poklianus (Fabaceae, Desmodieae), a new species from India. PhytoKeys 68: 117-124. https://doi.org/10.3897/phytokeys.68.9975
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A new species, Alysicarpus poklianus Gholami & Pandey from Sinhgarh, Maharashtra, India is described. It is morphologically most similar to A. hamosus but differs in having ovate leaves, rounded-ovate bracts, larger size of calyx, pods comprising 5–7 longer than broad joints with easily separable septa. In this study, a comprehensive description, and identification key of A. poklianus are provided.
Alysicarpus , endemic new taxon, taxonomy, India
The genus Alysicarpus Necker ex Desvaux, a member of tribe Desmodieae, family Fabaceae, comprises approximately 30 species distributed in tropical and subtropical regions of the old world (
The genus Alysicarpus is characterized by its calyx with reticulate or striate venation, and turgid indehiscent pods. The leaves are generally unifoliolate or rarely pinnately 3-foliolate (
During the taxonomic revision of the genus Alysicarpus, field trips were made to different parts of India and several specimens were collected. We compared our collected specimens with all the voucher specimens of Alysicarpus species deposited in different herbaria (
The overall morphology of the new species was examined by stereobinocular microscope (SMZ 1000). For morphological comparisons, we consulted herbarium specimens kept in different herbaria in India (
Differences between Alysicarpus poklianus, A. hamosus and A. ovalifolius.
Characters | A. poklianus sp. nov. | A. hamosus | A. ovalifolius |
---|---|---|---|
Stem | Densely covered with long hairs | Densely covered with long hairs | Glabrous or sparsely covered with short hairs |
Leaves | Unifoliolate | Unifoliolate mixed with trifoliolate | Unifoliolate |
Leaflet shape | Ovate to orbicular | Orbicular | Ovate at base, lanceolate in the upper part |
Leaflet size | 10–50 × 5–40 mm | 5–20 × 5–20 mm | 20–60 × 10–20 mm |
Inflorescence | 50–150 mm long | 30–40 mm long | 50–150 mm long |
Pedicel | 2–5 mm long, filiform | 1–3 mm long, thick | 1–2 mm long, thick |
Calyx | 3–5 mm long | 1–3 mm long | 4–6 mm long |
Pod size | 15–20 × 2–3 mm | 10–15 × 2–3 mm | 15–20 × 2–3 mm |
Pod joints | 5–7 joints, longer than broad | 3–5 joints, broader than long | 5–8 joints, longer than broad |
Pod septa | Present, easily separable | Present, not easily separable | Septa absent |
Spermoderm | Rugulate | Rugulate | Foveo-rugulate |
For SEM study, mature seeds were mounted on aluminum stubs with double adhesive tape and sputter-coated with gold palladium in a JFC-1600 Autofine coater, JEOL, Japan sputter coating unit. Samples were examined using a Scanning Electron Microscope JSM-6610LV, JEOL, Japan, at the Department of Botany, University of Delhi, India.
Alysicarpus poklianus is distinct from A. hamosus in having ovate leaves, longer pods with easily separable septa and foveo-regulate pattern of spermoderm. Table
Diagnostic characters for Alysicarpus poklianus include ovate leaves, 5–7 joint pods, easily separable septa and foveo-regulate spermoderm.
INDIA. Maharashtra: Sinhgarh, 18°21’56.39”N, 73°45’18.97”E, 587 m, 19 October 2014, Gholami & Pandey 4642 (holotype
Annual, prostrate to procumbent, profusely branched, slender, 30–50 cm long, stem densely covered with long hairs.Stipules triangular to linear, scarious, acute striate, 3–7 mm long, glabrous with ciliate margins. Petiole 5–6 mm, hairy. Leaflets ovate to oval, 15–35 × 5–20 mm, apex rounded to mucronulate, both surfaces hairy though the density of hair on lower surface is more. Inflorescence axillary or terminal, 50–150 mm long, lax with stiff hairs. Flowers in pairs, 2–3 pairs along each rachis, subtended by deciduous bract and secondary bracts; pedicels 3–5 mm long. Bracts rounded to ovate, 3–4 mm long, acute, ciliate at margins with long hairs; secondary bracts 1–3 mm long, lanceolate to triangular, ciliate at margins with long hairs. Calyx much shorter than the first joint of the pod; 2–3 mm long, tube very short, c. 1 mm long, lobes acute, not imbricated, ciliate all over. Standard petal light pink, 2–3 mm long, emarginated at apex; wing petals dark pink, 3–3.5 mm long; keel petal boat-shaped, bent and folded, c. 3 mm long. Stamens diadelphous, 2–3 mm long. Ovary 1.5–3 mm long, pubescent. Pods cylindrical, 15–20 mm long, 1.5–2 mm broad, compressed, 5–7 jointed, clothed with straight and hooked hairs, septa between two joints of pod boat-shaped,easily separable. Seeds light to dark brown, 2 × 1 mm, oval, smooth, spermoderm rugulate.
The species is named in honor of Prof. D.S. Pokle who has done extensive work on the taxonomy of the genus Alysicarpus in India.
Flowering from August to October; fruiting from September to November.
1 | Joints of pods strongly transversely rugose, never tetragonal. | 2 |
– | Joints of pods tetragonal, rugose, reticulated or smooth | 5 |
2 | Inflorescence short dense, calyx and bract conspicuously ciliated, pod not exserted from calyx | A. scarious |
– | Inflorescence long dens or lax, calyx and bract less ciliated or glabrous, pod exserted from calyx | 3 |
3 | Secondary bract present | A. rugosus |
– | Secondary bract absent | 4 |
4 | Stem densely pubescent, calyx and bract slightly ciliate, leave ovate | A. heyneanus |
– | Stem glabrous or with a line of hair, calyx and bract glabrous, leaves usually linear-lanceolate | A. ludens |
5 | Joints of pods reticulated or tetragonal rugose, calyx and bract densely covered with silky white hairs | 6 |
– | Joints of pods slightly reticulate or smooth, hairs in calyx and bract not silky white | 8 |
6 | Leaflets 3-nerved at base, inflorescence long, pods included in the calyx | A. pubescens |
– | Leaflets 1-nerved at base, inflorescence short, podexserted from calyx | 7 |
7 | Joint of pod tetragonal, as long as broad, conspicuously reticulate | A. tetragonolobus |
– | Joint of pod 4-winged, longer than broad, obscurely reticulate | A. luteovexillatus |
8 | Calyx reticulate-veined, shorter than first joint of pod | 9 |
– | Calyx striate-veined, longer than first joint of pod | 13 |
9 | Pod moniliform | A. monilifer |
– | Pod cylindric not moniliform | 10 |
10 | Pod not pubescent or hairs are short | 11 |
– | Pod conspicuously pubescent with long hair | 12 |
11 | Infructescence lax, leaflets dimorphic | A. ovalifolius |
– | Infructescence dense, leaflets uniform | A. vaginalis |
12 | Pod 3–5 joint, joints of pod broader than long, pod septa not easily separable, leaflets orbicular, mix one and three foliolate | A. hamosus |
– | Pod 5–7 joint, joints of pod longer than broad, pod septa easily separable, leaflets ovate, one foliolate | A. poklianus |
13 | Pod puberulous, calyx and bract densely pubescent, secondary bract absent | A. longifolius |
– | Pod glossy, glabrous, calyx and bract slightly ciliate at the margin, secondary bract present | |
14 | Pedicel 3–4 mm long filiform, pod drooping | A. gamblei |
– | Pedicel 1–2 mm long, pod straight | 15 |
15 | Pod moniliform, branches glabrous, leflets elliptic oblong | A. gautalensis |
– | Pod cylindrical, branches covered with appressed hairs | 16 |
16 | Leaflets linear lanceolate, calyx and bract almost glabrous | A. bupleurifolius |
– | Leaflets usually ovate-obovate, calyx and bract more ciliate | A. naikianus |
INDIA, Maharashtra, Nanded, Bodhadi, 14.12.1997, A. S. Dhabe, 913 (
We thank Prof. S.R. Yadav, Shivaji University, Kolhapur, for help in field trips. We would like to thanks Dr Paramjit Singh, Director, Botanical Survey of India and Incharge of different herbaria (