Knema Lour.

First published in Fl. Cochinch.: 604 (1790)
This genus is accepted
The native range of this genus is S. Central China to Tropical Asia.

Descriptions

Timothy M. A. Utteridge and Laura V. S. Jennings (2022). Trees of New Guinea. Kew Publishing. Royal Botanic Gardens, Kew

Distribution
A genus of 100 species in western Malesia; a single species, Knema tomentella Warb., has been recorded from a single collection from the Bird’s Head Peninsula of Indonesian New Guinea, but this may be an erroneous collection based on incorrect locality information.
Morphology General Habit
Trees to 30 m; twigs without lenticels, not flaky
Morphology Leaves
Leaves not conspicuously brittle when dry, whitish below. Inflorescences sessile (New Guinea), simple or bifurcated on wart- or worm-like densely scar-covered brachyblasts; flowers in apical subumbels
Morphology Reproductive morphology Flowers
Staminate flowers: rotate, (thinly) carnose, inside glabrous, reddish, lobes 3, spreading at anthesis; androecium stalked, androecium flat with 3–11(–25) ellipsoid anthers attached at the margin, shortly stiped (New Guinea) Flowers unisexual (plants dioecious), pedicellate, bracteole present (minute), usually persistent
Morphology Reproductive morphology Flowers Gynoecium Pistil
Pistillate flowers: ovary pubescent, style short or absent, stigma 2-lobed
Morphology Reproductive morphology Fruits
Fruits obovoid to ellipsoid, 2–5 cm long, tomentose with rusty hairs or early glabrescent (never glabrous as in some Horsfieldia and Myristica), pericarp leathery; aril entire or laciniate at the apex only
Morphology Reproductive morphology Seeds
Seed ellipsoid, not variegated.
Ecology
Found in primary and degraded forests to 1500 m.
Recognition
It is recognised by the Myristicaceous habit (see Endocomia notes), and the leaves which are whitish below, the short, wart- or worm-like inflorescences (usually less than 2.5 cm long) with flowers of a single sex subtended by a small bracteole and the fruits which are covered with rusty hairs and the seed covered by an entire aril. As in many species of Knema, the New Guinea species is rusty-hairy on the young twigs, lower surface of the leaves when young, and the fruits.
[TONG]

Sources

  • Herbarium Catalogue Specimens

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Trees of New Guinea

    • Trees of New Guinea
    • http://creativecommons.org/licenses/by-nc-sa/3.0