Leptopus cordifolius Decne.

First published in V.Jacquemont, Voy. Inde 4: 155 (1844)
This species is accepted
The native range of this species is E. Afghanistan to Himalaya and NW. India. It is a shrub and grows primarily in the subtropical biome.

Descriptions

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

Type
India, Hort. Calc. Kumaon, 1824, Wallich Catalogue 7913a (holotype K-W!; isotypes A!, E!, K!).
Morphology General Habit
Monoecious erect shrub, 0.5 – 3 m. Stem straight
Morphology Twigs
Twigs longitudinally ribbed, sometimes terete, glabrous to hirsute, light green to brown
Morphology Leaves Stipules
Stipules deltoid, basally not auriculate, apically acute, ferrugineous to almost black, 0.4 – 1.5 × 0.4 – 0.7 mm, hirsute, margin entire, densely ciliate
Morphology Leaves Petiole
Petiole 8 – 34 × 3 – 8 (adult), 0.3 – 0.5 mm (on brachyblasts), at least ¼ of leaf blade length (adult), shorter than ¼ of leaf blade (on brachyblasts), glabrous to hirsute
Morphology Leaves
Leaf blade ovate, sometimes oblong, basally rounded to truncate, sometimes cordate, apically rounded, sometimes mucronate, (1.5) 2 – 5 (8.5) × (0.6) 1 – 2 (3.5) cm, 2 – 3 times longer than wide, chartaceous, drying concolorous to discolorous green to brown, grey or dark red, glabrous (rarely hirsute) adaxially, glabrous to hirsute abaxially, margin glabrous to hirsute; midvein adaxially flat to impressed, abaxially prominent or flat, secondary veins 4 – 7 pairs, adaxially flat to impressed, abaxially prominent to flat. Inflorescences unisexual or bisexual, male inflorescence axis 0 – 0.1 (3) mm long
Morphology Reproductive morphology Inflorescences Bracts
Bracts as stipules
Morphology Reproductive morphology Flowers
Male flowers 1 – 4 per fascicle, 1.5 – 3 × 4 – 6 mm Female flowers 1 – 2 per fascicle, 2.5 – 6 × 4 – 8 mm, 1.5 – 3 times larger than males, rotate. Pedicel 13 – 30 mm long, not articulate, glabrous to hirsute
Morphology Reproductive morphology Flowers Pedicel
Pedicel 5 – 22 × less than 1.5 mm, articulate just above base, glabrous to hirsute Fruiting pedicel 15 – 36 mm long
Morphology Reproductive morphology Flowers Calyx
Sepals 5, obovate to oblong, apically rounded, 1.5 – 3 × 1 – 1.7 mm, membranaceous, 3 – 6-veined, hirsute outside, glabrous inside, margin entire to erose, glabrous to ciliate, eglandular Sepals 5, ovate to obovate or oblong, apically obtuse to cuspidate, 2 – 4 × 1.2 – 4 mm, 0 – 6-veined, hirsute outside, glabrous inside, margin entire, glabrous to ciliate, eglandular Mature sepals not accrescent
Morphology Reproductive morphology Flowers Corolla
Petals 5, obovate, apically rounded, 1.2 – 2.2 × 0.6 – 1 mm ⅔ of sepal length to almost as long as sepals, membranaceous, 1 – 4-veined, glabrous on both sides, margin entire to erose or undulate, glabrous Petals 5, obovate, apically rounded to truncate, 0.2 – 0.6 × 0.2 – 0.6 mm, extending slightly beyond the disc, without veins, glabrous
Morphology Reproductive morphology Flowers Disc
Disc bilobed for ⅓ – ⅔ of length, lobes apically rounded, 0.4 – 0.8 × 0.2 – 0.5 mm, ¼ – ½ as long as sepals, ⅓ – ½ as long as petals Disc bilobed for ⅓ – ½ of length, 0.3 – 1 × 0.3 – 0.7 mm, apically rounded, entire to erose or crenulate, up to ¼ of sepal length
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 5, 1.3 – 2.2 mm long; filaments 1.2 – 2 mm long; anthers 0.2 – 0.3 × 0.2 – 0.25 mm
Morphology Reproductive morphology Flowers Gynoecium Pistillodes
Pistillode trilobed for ¾ of length or to base, 0.2 – 0.5 mm long, ⅛ – ¼ of stamen length, glabrous
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 3-locular, glabrous; styles 3, 0.8 – 1.6 mm long, free, glabrous; stigmas capitate
Morphology Reproductive morphology Fruits
Fruit 3.5 – 4.5 × 5 – 7 mm, smooth to faintly reticulate, glabrous, drying red brown to brown. Columella widest at base, apically linear, 2 – 3 × c. 0.5 mm
Morphology Reproductive morphology Seeds
Seeds triquetrous, 2 – 3.5 × 1.8 – 2.5 × 1.8 – 2.5 mm, without appendages, smooth, yellow to red brown
Morphology Reproductive morphology Seeds Embryo
Embryo with radicle up to ½ as long as cotyledons
Distribution
From north Pakistan through north India and Nepal to West Himalaya. Map 1.
Ecology
Stony slopes and open woodland; 1000 – 3000 m.
Conservation
Least concern (LC): extent of occurrence exceeds 20,000 km2.
Note
All parts of this species are larger than those of Leptopus chinensis, with longer petioles and apically rounded leaves. Distinguishing L. cordifolius and L. chinensis can be difficult, especially in young specimens of L. cordifolius; the two species are clearly closely related. Individuals between the Himalayas and western China often possess characters intermediate between L. chinensis and L. cordifolius.
[KBu]

Sources

  • 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 Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 World Checklist of Vascular Plants. 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 Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0