Leptopus emicans (Dunn) Pojark.

This species is accepted, and its native range is Arunachal Pradesh to N. Myanmar.

[KBu]

Vorontsova, M.S. & Hoffmann, P. 2009. Revision of the genus Leptopus (Phyllanthaceae, Euphorbiaceae sensu lato). Kew Bulletin 64: 627. DOI: https://doi.org/10.1007/s12225-009-9155-x

Conservation
Vulnerable (VU B1a,b(iii)) (IUCN 2001). Extent of occurrence is below 20,000 km2 and the species is known from two areas only. Agricultural expansion is an increasing threat.
Distribution
East Himalaya and Burma.
Ecology
Riverine vegetation; altitude not known.
Morphology General Habit
Monoecious erect shrub, up to 3 m. Twigs longitudinally ribbed, glabrous, green brown
Morphology Leaves
Leaf blade elliptic, basally acute, sometimes rounded, apically acuminate to caudate, (3) 6 – 12 (13.5) × (1) 1.5 – 4 (4.6) cm, 2.5 – 3.5 times longer than wide, membranaceous, drying slightly discolorous brownish green, glabrous on both sides, margin glabrous, the caudex 10 – 15 mm long; midvein adaxially flat to prominent, abaxially prominent, secondary veins 8 – 10 pairs, adaxially flat to prominent, abaxially prominent
Morphology Leaves Petiole
Petiole 10 – 47 × 0.5 – 1 mm, ⅓ – ¼ of leaf blade length, glabrous
Morphology Leaves Stipules
Stipules deltoid, basally not auriculate, apically acute, translucent, c. 1 × 0.5 mm, glabrous, margin laciniate, glabrous
Morphology Reproductive morphology Flowers
Male and young female flowers not seen Female flowers 1 – 3 per fascicle, rotate
Morphology Reproductive morphology Flowers Calyx
Mature sepals 5, ovate to obovate, apically truncate to obtuse, 1 – 1.5 × 1 mm, 1-veined, glabrous outside, glabrous inside, margin erose, glabrous, eglandular Mature petals 5, obovate, apically rounded to emarginate, c. 0.3 × 0.2 mm, slightly shorter than disc, without veins, glabrous
Morphology Reproductive morphology Flowers Disc
Disc bilobed for ¾ of length, 0.4 – 0.8 × 0.2 – 0.3 mm, apically rounded, entire to erose, up to ⅓ of sepal length
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 3 (4)-locular, glabrous; styles 3 (4), 0.6 – 0.8 mm long, free, glabrous; stigmas dilated
Morphology Reproductive morphology Flowers Pedicel
Fruiting pedicel 10 – 15 mm long Pedicel not articulate, glabrous Male pedicels articulate c. 0.6 mm above base
Morphology Reproductive morphology Fruits
Fruit 2.5 – 3 × 4 – 5 mm, strongly reticulate, glabrous, drying green Columella basally almost linear, widest at apex, 1.5 – 2 × c. 0.5 mm
Morphology Reproductive morphology Inflorescences
Male inflorescence axis 0 – 3 mm long
Morphology Reproductive morphology Inflorescences Bracts
Bracts as stipules
Morphology Reproductive morphology Seeds
Seeds reniform, 1.5 – 2 × 1 – 1.5 × 1 – 1.5 mm, with fleshy orange micropylar appendage up to 0.3 mm in diam., smooth to dimpled, brown
Morphology Reproductive morphology Seeds Embryo
Embryo with radicle slightly shorter than cotyledons
Note
This rare endemic taxon is aberrant in the genus Leptopus and possibly represents an independent lineage. Several gynoecium characters cause doubt as to its identity as Leptopus. Orange spongy tissue protrudes from the micropylar end of the seed, a character unique in tribe Poranthereae and extremely rare in Phyllanthaceae. The chalaza end of the seed is more strongly curved than that of other Leptopus species as the fruit is raised on a short fleshy stipe visible on dissection of a female flower. Apex of the columella is unusual with tissue protruding sideways, unlike the apically linear columella of other Leptopus species. The presence of apically wide emarginate petals has only been noted on poor quality material. Unfortunately no fresh material was available for DNA extraction and the few collections of this species lack good quality male and young female material.
Type
India, Arunachal Pradesh, Outer Abor Hills, Kobo, 6 Dec. 1911, Burkill 37068 (lectotype K! K000186357, selected here; isolectotype K!). The chosen lectotype is the only syntype sheet with seed as well as female material at various stages of fruit development.

Native to:

East Himalaya, Myanmar

Leptopus emicans (Dunn) Pojark. appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Aug 1, 2007 Burkill, I.H. [37068], India K000186357 lectotype Yes
Aug 1, 2007 Burkill, I.H. [35955], India K000186358 No
Aug 1, 2007 Burkill, I.H. [37390], India K000186359 Yes
Aug 1, 2007 Burkill, I.H. [35955], India K000186360 Yes
Aug 1, 2007 Burkill, I.H. [37068], India K000186361 isolectotype Yes

First published in Bot. Mater. Gerb. Bot. Inst. Komarova Akad. Nauk S.S.S.R. 20: 272 (1960)

Accepted by

  • Chakrabarty, T. & Balakrishnan, N.P. (2018). Indo-Burmese Phyllanthaceae: A Taxonomic Revision: 1-437. Bishen Singh Mahendra Pal Singh, Dehra Dun.
  • Vorontsova, M.S. & Hoffmann, P. (2010). Revision of the genus Leptopus (Phyllanthaceae, Euphorbiaceae sensu lato). Kew Bulletin 64: 627-644.

Not accepted by

  • Govaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Andrachne emicans.]

Literature

Kew Backbone Distributions

  • Balakrishnan, N.P. & Chakrabarty, T. (2007). The family Euphorbiaceae in India. A synopsis of its profile, taxonomy and bibliography: 1-500. Bishen Singh Mahendra Pal Singh, Dehra Dun.

  • Herbarium Catalogue Specimens

    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Kew Bulletin

    Kew Bulletin
    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0