Microstegium Nees

First published in J.Lindley, Intr. Nat. Syst. Bot., ed. 2: 447 (1836)
This genus is accepted
The native range of this genus is Uganda to S. Africa, Tropical & Subtropical Asia to Pacific.

Descriptions

Gramineae, W. D. Clayton, S. M. Phillips And S. A. Renvoize. Flora of Tropical East Africa. 1974

Morphology General Habit
Rambling perennials, or sometimes annuals
Morphology Leaves
Leaf-blades linear to lanceolate, narrowed at the base and often with a short false petiole; ligule short, scarious
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, comprising up to 25 subdigitate racemes, these rarely solitary or with a short common axis; racemes fragile (very rarely tough), seldom conspicuously hairy, bearing paired spikelets, those of each pair alike; internodes and pedicels linear or rarely inflated
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets dorsally compressed; callus obtuse; lower glume herbaceous to cartilaginous, the back flat with a median groove and the margins sharply inflexed, acute or notched at the tip; upper glume acute or with a short awn point; lower floret ♂, reduced to a hyaline scale, or suppressed, these variants often mixed in the same panicle; upper lemma hyaline, linear to cordate, often minute, bidentate to bifid, with a glabrous awn from the sinus; stamens 3, rarely 2; caryopsis narrowly ellipsoid to lanceolate, dorsally flattened.
[FTEA]

nonem

Morphology General Habit
Annual (16), or perennial (10). Rhizomes absent (25), or elongated (1). Culms erect (2/24), or geniculately ascending (2/24), or decumbent (5/24), or prostrate (4/24), or rambling (12/24), or scandent (1/24); robust (3/8), or slender (4/8), or weak (1/8); 10-70.27-400 cm long; rooting from lower nodes (18/18). Culm-internodes terete (1/1). Lateral branches lacking (1/9), or sparse (1/9), or ample (7/9). Ligule an eciliate membrane (22), or a ciliolate membrane (3), or a fringe of hairs (1). Leaf-blade base without a false petiole (21), or with a brief petiole-like connection to sheath (2), or with a false petiole (3). Leaf-blades linear (7), or lanceolate (21), or elliptic (7), or oblong (2), or ovate (3); stiff (1), or firm (19), or flaccid (6).
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes single (5), or paired (3), or digitate (22); erect (1), or ascending (22), or spreading (4), or drooping (2). Rhachis tough (4), or fragile at the nodes (22); wingless (25), or narrowly winged (1); flattened (5/10), or angular (3/10), or semiterete (2/10). Spikelet packing contiguous (25), or lax (1). Rhachis internodes filiform (8), or linear (13), or columnar (1), or clavate (1), or cuneate (2), or pyriform (2). Rhachis internode tip cupuliform (1/1). Spikelets appressed (9/9); in pairs. Fertile spikelets sessile (2), or sessile and pedicelled (22), or pedicelled (2); 1 in the cluster (1), or 2 in the cluster (25); subequal (1/3), or the upper smaller (2/3). Companion sterile spikelets pedicelled (2/2); 1 in the cluster (2/2). Pedicels filiform (8), or linear (13), or clavate (4), or cuneate (1); tip widened (1/1).
Sterile
Basal sterile spikelets absent (25), or well-developed (1). Companion sterile spikelets absent (24), or rudimentary (1), or well-developed (2).
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (17), or elliptic (4), or oblong (7); laterally compressed (1), or dorsally compressed (25); 1.66-4.354-7 mm long; falling entire; deciduous from the base (25), or with accessory branch structures (22). Spikelet callus brief (24), or square (2); glabrous (3/19), or pubescent (6/19), or pilose (7/19), or bearded (5/19); base obtuse; attached transversely (25/25). Basal sterile spikelets absent (25), or well-developed (1). Companion sterile spikelets absent (24), or rudimentary (1), or well-developed (2).
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (17), or elliptic (4), or oblong (7); laterally compressed (1), or dorsally compressed (25); 1.66-4.354-7 mm long; falling entire; deciduous from the base (25), or with accessory branch structures (22). Spikelet callus brief (24), or square (2); glabrous (3/19), or pubescent (6/19), or pilose (7/19), or bearded (5/19); base obtuse; attached transversely (25/25).
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes exceeding apex of florets (2/2); firmer than fertile lemma. Lower glume linear (2), or lanceolate (3), or elliptic (14), or oblong (9); chartaceous (2), or cartilaginous (2), or coriaceous (22); 2-keeled; wingless (25), or winged on keel (1); 2-3 -veined (2/17), or 4 -veined (11/17), or 5 -veined (4/17), or 6-7 -veined (5/17), or 8 -veined (3/17), or 9 -veined (1/17). Lower glume lateral veins obscure (1), or distinct (25); without ribs (25), or ribbed (1); intercarinal veins distinct (2/3), or absent below, prominent above (1/3). Lower glume surface flat (3), or concave (8), or with a longitudinal median groove (16); smooth (19), or asperulous (3), or scabrous (5); glabrous (22), or puberulous (1), or pilose (3). Lower glume apex entire (21), or dentate (7); 2 -fid (7/7); emarginate (7/19), or truncate (1/19), or obtuse (7/19), or acute (5/19), or acuminate (1/19). Upper glume lanceolate (1), or elliptic (23), or oblong (2); membranous (3/7), or chartaceous (5/7), or cartilaginous (2/7); with undifferentiated margins (25), or hyaline margins (1); without keels (3/25), or 1-keeled (24/25); 1-2 -veined (1/16), or 3 -veined (14/16), or 4 -veined (1/16), or 5 -veined (2/16), or 6 -veined (1/16), or 7 -veined (2/16). Upper glume primary vein eciliate (22), or ciliolate (1), or ciliate (3). Upper glume lateral veins with cross-veins (1/1). Upper glume surface smooth (25), or scabrous (1); glabrous (24), or pilose (2). Upper glume apex entire (23), or dentate (3); 2 -fid (3/3); acute (12/17), or acuminate (4/17), or attenuate (2/17); muticous (15), or mucronate (3), or awned (9); 1 -awned (9/9).
Morphology Reproductive morphology Flowers Florets
Basal sterile florets male (9/21), or barren (15/21); with palea (10/20), or without significant palea (10/20). Lemma of lower sterile floret linear (3/17), or lanceolate (10/17), or oblong (5/17); hyaline (18/18); 0 -veined (2/3), or 1 -veined (1/3), or 3 -veined (1/3); obtuse (2/3), or acuminate (1/3); muticous (16/17), or awned (1/17). Palea of lower sterile floret hyaline (8/10), or membranous (2/10). Fertile lemma linear (9), or lanceolate (4), or oblong (8), or ovate (1), or orbicular (5); hyaline (25), or membranous (1); without keel; 0 -veined (11/13), or 3 -veined (2/13). Lemma surface glabrous (25), or pubescent (1). Lemma margins eciliate (23), or ciliolate (1), or ciliate (2). Lemma apex entire (6), or dentate (13), or lobed (8); 2 -fid (21/21); incised 0.25-0.4575-0.75 of lemma length; emarginate (2/5), or acuminate (3/5); muticous (2), or mucronate (1), or awned (24); 1 -awned (24/24). Principal lemma awn apical (6/25), or from a sinus (20/25); straight (2/25), or flexuous (7/25), or geniculate (16/25); attenuate (23/25), or with thread-like crinkled tip (2/25). Palea present (15), or absent or minute (11); 0.33-0.8883-1 length of lemma; hyaline (9/15), or membranous (6/15); 0 -veined (1/1); without keels (2/15), or 2-keeled (13/15). Palea surface glabrous (13/15), or pilose (2/15). Palea apex dentate (2/2).
Morphology Reproductive morphology Flowers
Lodicules 2 (5/5). Anthers 2 (6/22), or 3 (16/22).
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp (3/3); fusiform (1/2), or obovoid (1/2). Embryo 0.25-0.375-0.5 length of caryopsis. Hilum punctiform (1/1).
Distribution
Africa (3), or Temperate Asia (15), or Tropical Asia (18), or Australasia (1), or Pacific (3), or North America (1).
[GB]

Gramineae, T. A. Cope. Flora Zambesiaca 10:4. 2002

Morphology General Habit
Inflorescence of 1–many subdigitate racemes; racemes fragile, sparsely pilose, with filiform to clavate internodes.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets alike (though the pedicelled sometimes a little smaller), paired, one sessile, one pedicelled, dorsally compressed, the callus obtuse.
Morphology Reproductive morphology Inflorescences Bracts Glume
Superior glume often shortly awned. Inferior glume herbaceous to cartilaginous, the back flat with a median groove, sharply inflexed on the flanks, acute to bidentate.
Morphology Reproductive morphology Flowers Florets
Inferior floret very variable, male, reduced to a hyaline scale or suppressed.
Morphology Reproductive morphology Inflorescences Bracts Lemma
Superior lemma linear to cordate, entire to bifid, with a glabrous awn.
[FZ]

Sources

  • Flora Zambesiaca

    • Flora Zambesiaca
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • 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
  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
  • 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