GrassBase - The Online World Grass Flora

Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Homolepis

HABIT Annual (1), or perennial. Rhizomes absent (4), or short (1). Stolons absent (3), or present (2). Culms erect (2), or geniculately ascending (2), or decumbent (2), or rambling (1); 15–79.5–200 cm long; rooting from lower nodes (1/1). Culm-nodes flush with internodes (2/2). Lateral branches lacking (1/2), or sparse (1/2). Leaves differentiated into sheath and blade (4), or without demarcation between sheath and blade (1). Ligule an eciliate membrane (1), or a ciliolate membrane (2), or a ciliate membrane (1), or a fringe of hairs (1). Leaf-blades linear (3), or lanceolate, or oblong (1); stiff (1), or firm (4).

INFLORESCENCE Inflorescence a panicle.

Panicle open (4), or contracted (1). Primary panicle branches not whorled (4), or whorled at lower nodes (1).

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform (2/3), or clavate (1/3).

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate (1), or elliptic (3), or obovate (2); dorsally compressed; 2.49–5.899–11 mm long; falling entire. Spikelet callus brief (4), or square (1).

GLUMES Glumes reaching apex of florets (1), or exceeding apex of florets (4); thinner than fertile lemma. Lower glume ovate; 1 length of upper glume; membranous; without keels; 5 -veined (3), or 6 -veined (2), or 7 -veined (3), or 8 -veined (2), or 9 -veined (3). Lower glume lateral veins without ribs (4), or ribbed (1). Lower glume surface without pits; glabrous, or villous (1). Lower glume apex acute. Upper glume ovate; membranous; with undifferentiated margins (4), or hyaline margins (1); without keels; 5 -veined (2), or 7 -veined (3), or 8–9 -veined (1). Upper glume surface glabrous (4), or pilose (1). Upper glume apex acute (4), or acuminate (1).

FLORETS Basal sterile florets male (1), or barren (4); with palea. Lemma of lower sterile floret ovate; membranous; 5 -veined (3), or 6 -veined (2), or 7 -veined (4); acute. Fertile lemma lanceolate (1), or elliptic (2), or oblong (1), or ovate (1); dorsally compressed (1/1); cartilaginous (2), or coriaceous (1), or indurate (2); without keel; wingless; 5 -veined (2/2). Lemma surface unwrinkled; without grooves; glabrous, or pubescent (1). Lemma margins flat (4), or involute (1); exposing palea (4), or covering most of palea (1). Lemma apex obtuse (2), or acute (3). Palea not rolled (4), or involute (1); 1 length of lemma; cartilaginous (2), or coriaceous (1), or indurate (2).

FLOWER Anthers 3 (1/1).

FRUIT Caryopsis with adherent pericarp (2/2); oblong (1/2), or obovoid (1/2). Embryo 0.4–0.45–0.5 length of caryopsis. Hilum linear (3/3); 0.5–0.6667–1 length of caryopsis.

DISTRIBUTION North America (2), or South America.

Please cite this publication as detailed in How to Cite Version: 27th January 2014.