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.

Schizostachyum

HABIT Perennial. Rhizomes short; pachymorph. Culms erect (30/47), or arching (8/47), or leaning (13/47), or scandent (5/47); 152–997.4–2600 cm long; woody. Culm-internodes terete. Culm-nodes flush with internodes (5/9), or swollen (4/9). Lateral branches dendroid. Branch complement one (1/31), or two (1/31), or several (8/31), or many (23/31); in a clump (7/7); with subequal branches (16/17), or 1 branch dominant (1/17). Culm-sheaths persistent (7/26), or tardily deciduous (7/26), or deciduous but leaving a persistent girdle (1/26), or deciduous (12/26); without auricles (18/46), or auriculate (28/46). Culm-sheath blade linear (14/48), or lanceolate (21/48), or narrowly ovate (1/48), or ovate (7/48), or triangular (13/48); narrower than sheath (6/9), or as wide as sheath at base (3/9). Leaf-sheath auricles absent (37), or erect (6), or falcate (18). Ligule an eciliate membrane (45), or a ciliolate membrane (7), or a ciliate membrane (9). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades persistent (59), or deciduous at the ligule (1); linear (3), or lanceolate (50), or elliptic (2), or oblong (13), or ovate (2); stiff (1), or firm (59). Leaf-blade midrib evident (1/5), or conspicuous (4/5). Leaf-blade venation without cross veins (51), or with obscure cross veins (3), or with distinct cross veins (6).

INFLORESCENCE Synflorescence bractiferous (52/52); scanty (1/52), or linear (3/52), or clustered at the nodes (48/52); in stellate clusters (3/48), or untidy tufts (45/48); with glumaceous subtending bracts (46/52), or spathaceous subtending bracts (6/52); with axillary buds at base of spikelet (52/52); leafy between clusters (5/29), or leafless between clusters (25/29), or leafless between branches (1/29).

Fertile spikelets sessile (51/52), or sessile and pedicelled (1/52), or pedicelled (1/52).

FERTILE SPIKELETS Spikelets comprising 0 basal sterile florets (2/5), or 1 basal sterile florets (3/5), or 2 basal sterile florets (2/5); 1 fertile florets (44/52), or 2 fertile florets (7/52), or 3 fertile florets (5/52), or 4 fertile florets (3/52), or 5 fertile florets (2/52), or 6–7 fertile florets (1/52); without rhachilla extension (3/52), or with a barren rhachilla extension (17/52), or with diminished florets at the apex (34/52). Spikelets linear (6/52), or lanceolate (46/52), or oblong (2/52); laterally compressed (33/52), or subterete (19/52); 6–21.13–75 mm long; breaking up at maturity (52/52); disarticulating below each fertile floret (52/52). Rhachilla internodes brief up to lowest fertile floret (51/52), or elongated below proximal fertile floret (1/52); definite (13/13); glabrous (12/13), or sparsely hairy (1/13).

GLUMES Glumes one the lower absent or obscure (4/52), or two (14/52), or several (37/52); persistent (36/37), or lower persistent, upper deciduous (1/37); shorter than spikelet (39/39). Lower glume lanceolate (1/18), or oblong (1/18), or ovate (16/18); 1 length of upper glume; chartaceous (3/3); without keels (3/4), or 1-keeled (1/4); 3–4 -veined (1/4), or 5–6 -veined (2/4), or 7 -veined (3/4), or 8–10 -veined (1/4), or 11 -veined (2/4). Lower glume surface without pits (49/49). Lower glume apex acute (3/10), or acuminate (6/10), or attenuate (1/10); muticous (16/18), or mucronate (1/18), or awned (1/18). Upper glume lanceolate (3/30), or oblong (3/30), or ovate (24/30); 0.3–0.35–0.4 length of adjacent fertile lemma; chartaceous (14/14); without keels (6/8), or 1-keeled (2/8); 3–4 -veined (1/7), or 5–7 -veined (4/7), or 10 -veined (1/7), or 11 -veined (2/7), or 12–14 -veined (1/7), or 16–18 -veined (1/7). Upper glume lateral veins with cross-veins (1/1). Upper glume surface glabrous (51/52), or pilose (1/52). Upper glume apex obtuse (1/17), or acute (9/17), or acuminate (6/17), or attenuate (1/17), or setaceously attenuate (1/17); muticous (20/30), or mucronate (8/30), or awned (2/30); 1 -awned (2/2).

FLORETS Basal sterile florets barren (2/2); without significant palea (1/1). Lemma of lower sterile floret lanceolate (1/4), or ovate (3/4); 9 -veined (2/2); emarginate (1/4), or obtuse (1/4), or acute (1/4), or acuminate (1/4), or attenuate (1/4); muticous (2/4), or mucronate (1/4), or awned (1/4). Fertile lemma lanceolate (15/52), or elliptic (1/52), or oblong (4/52), or ovate (37/52); chartaceous (52/52); without keel (51/52), or keeled (1/52); wingless (52/52); 5–12–22 -veined. Lemma lateral veins prominent (1/1). Lemma surface unwrinkled (52/52); without grooves (52/52); glabrous (41/52), or puberulous (1/52), or pubescent (7/52), or pilose (2/52), or hispid (1/52). Lemma margins flat (10/52), or convolute (42/52); exposing palea (10/52), or covering most of palea (42/52); eciliate (43/52), or ciliolate (3/52), or ciliate (7/52). Lemma apex truncate (1/50), or obtuse (1/50), or acute (37/50), or acuminate (6/50), or attenuate (6/50), or apiculate (1/50); without ornament (51/52), or pubescent (1/52); muticous (33/52), or mucronate (7/52), or awned (14/52); 1 -awned (11/11). Palea not rolled (10/52), or tightly convolute around flower (42/52); 1–1.025–1.1 length of lemma; chartaceous (52/52); 7–11–20 -veined; without keels (20/52), or 1-keeled (2/52), or 2-keeled (31/52). Palea keels separated (26/31), or contiguous above a sulcus (5/31); eciliate (27/33), or ciliolate (1/33), or ciliate (5/33). Palea surface glabrous (48/52), or puberulous (1/52), or pubescent (3/52), or pilose (1/52). Palea apex entire (1/28), or dentate (27/28); muticous (45/52), or with excurrent keel veins (1/52), or awned (6/52). Apical sterile florets resembling fertile though underdeveloped (2/34), or distinct from fertile (32/34); 1 in number (28/28); male (2/13), or barren (12/13); rudimentary (25/27), or lanceolate (2/27), or ovate (1/27). Apical sterile lemmas muticous (31/32), or mucronate (1/32).

FLOWER Lodicules absent (14/46), or 1 (2/46), or 2 (2/46), or 3 (30/46), or several (1/46); glabrous (21/33), or ciliate (12/33). Anthers 4 (1/52), or 6 (51/52). Stigmas 2 (3/50), or 3 (49/50). Ovary with a steeple-like appendage (52/52); glabrous (16/22), or pubescent on apex (1/22), or pubescent all over (5/22).

FRUIT Caryopsis with free brittle pericarp (52/52); fusiform (3/17), or ellipsoid (1/17), or oblong (10/17), or ovoid (2/17), or obovoid (1/17). Embryo 0.05 length of caryopsis. Hilum linear (1/1); 1 length of caryopsis.

DISTRIBUTION Africa (1), or Temperate Asia (11), or Tropical Asia (51), or Pacific (3).

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