Apocopis Nees

First published in Proc. Linn. Soc. London 1: 93 (1841)
This genus is accepted
The native range of this genus is Indian Subcontinent to S. China and Malesia.

Descriptions

nonem

Morphology General Habit
Annual (11), or perennial (5). Rhizomes absent (15), or short (1). Culms erect (3/7), or geniculately ascending (2/7), or decumbent (2/7), or rambling (1/7); slender (2/2); 5-32.09-90 cm long; firm (14), or wiry (2). Culm-nodes constricted (1/1). Lateral branches ample (3/3). Ligule an eciliate membrane (14), or a ciliolate membrane (2). Leaf-blades linear, or lanceolate (7); firm (13), or flaccid (3). Leaf-blade midrib conspicuous (2/2). Leaf-blade margins cartilaginous (1/1).
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes; subtended by an unspecialized leaf-sheath (13), or an inflated leaf-sheath (2), or a spatheole (1); exserted (15), or enclosed (1). Racemes single (1), or paired (15), or digitate (3); erect (5), or ascending (13). Rhachis fragile at the nodes; subterete (14/14). Rhachis internodes linear (14), or clavate (1), or cuneate (1). Spikelets appressed (15/15); in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels adnate at the base to lower glume of sessile spikelet; linear.
Morphology Reproductive morphology Inflorescences Spikelets
Basal sterile spikelets absent (11), or well-developed (5). Companion sterile spikelets represented by barren pedicels (14), or rudimentary (1), or well-developed (2). Companion sterile spikelet glumes muticous (1/1). Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong (14), or obovate (4), or cuneate (1); dorsally compressed; 3-5.209-9.6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus bearded (5/5); base obtuse; attached transversely.
Sterile
Basal sterile spikelets absent (11), or well-developed (5). Companion sterile spikelets represented by barren pedicels (14), or rudimentary (1), or well-developed (2). Companion sterile spikelet glumes muticous (1/1).
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong (14), or obovate (4), or cuneate (1); dorsally compressed; 3-5.209-9.6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus bearded (5/5); base obtuse; attached transversely.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reaching apex of florets (13), or exceeding apex of florets (3); firmer than fertile lemma. Lower glume lanceolate (1), or elliptic (1), or oblong (10), or obovate (6), or cuneate (2); membranous (1), or chartaceous (6), or coriaceous (10); without keels; 5 -veined (1/13), or 7 -veined (11/13), or 9-13 -veined (1/13). Lower glume lateral veins obscure (1), or distinct (15); without ribs (15), or ribbed (1). Lower glume surface convex (15), or flat (1); smooth (13), or asperulous (2), or scabrous (1); glabrous (12), or pilose (6), or hispid (2). Lower glume apex entire (8), or erose (7), or dentate (1); 3-5 -fid (1/1); emarginate (4), or truncate (13), or obtuse (1); muticous (15), or mucronate (1). Upper glume lanceolate (1/15), or oblong (14/15); membranous (1), or chartaceous (15); with undifferentiated margins (13), or hyaline margins (3); 3 -veined (11/11). Upper glume surface smooth (14), or scabrous (2); glabrous (12), or pubescent (1), or pilose (3). Upper glume apex entire (14), or erose (2); truncate (11/12), or acuminate (1/12).
Morphology Reproductive morphology Flowers Florets
Basal sterile florets male, or barren (3); with palea. Lemma of lower sterile floret lanceolate (7), or elliptic (2), or oblong (9), or ovate (1); hyaline; 0 -veined (10/12), or 1 -veined (2/12); truncate (3/5), or obtuse (2/5). Fertile florets bisexual, or female (1). Fertile lemma linear (3), or lanceolate (5), or oblong (11); hyaline (10), or membranous (1), or chartaceous (5); of similar consistency on margins (15), or much thinner on margins (1); without keel; 0 -veined (1/13), or 1 -veined (13/13). Lemma surface smooth (14), or scabrous (2); glabrous (15), or pilose (1). Lemma margins eciliate (15), or ciliate (1). Lemma apex entire (4), or erose (1), or dentate (12), or lobed (2); 2 -fid (14/14); muticous (2), or mucronate (1), or awned (15); 1 -awned (15/15). Principal lemma awn apical (5), or from a sinus (14); straight (1), or geniculate (15). Column of lemma awn glabrous (4/15), or hispidulous (8/15), or puberulous (1/15), or pubescent (2/15). Palea not rolled (15), or tightly convolute around flower (1); hyaline (12), or membranous (4); 0 -veined (11/12), or 2 -veined (1/12); without keels (12), or 2-keeled (4).
Morphology Reproductive morphology Flowers
Lodicules absent (13/13). Anthers 2 (13/13). Stigmas 2-3 (1/1).
Distribution
Temperate Asia (4), or Tropical Asia (15).
[GB]

Sources

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • 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