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.

Pseudosasa

HABIT Perennial. Rhizomes absent (3), or elongated (16); leptomorph (16/16). Culms erect (15/15); 40–312.6–1300 cm long; woody; without nodal roots (1/1). Culm-internodes terete. Culm-nodes flush with internodes (4/6), or swollen (2/6); with distinct supra-nodal ridge (2/2). Lateral branches suffrutescent (1), or dendroid (18). Branch complement one (11/18), or two (12/18), or three (13/18), or several (1/18); solitary (2/2); as thick as stem (2/2). Culm-sheaths persistent (4/9), or tardily deciduous (3/9), or deciduous but leaving a persistent girdle (1/9), or deciduous (3/9); without auricles (9/13), or auriculate (4/13). Culm-sheath blade linear (6/15), or lanceolate (12/15), or triangular (3/15); narrower than sheath (1/2), or as wide as sheath at base (1/2). Leaf-sheath auricles absent (15), or erect (1), or falcate (5). Ligule an eciliate membrane (10), or a ciliolate membrane (8), or a ciliate membrane (1). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades linear (1), or lanceolate (18), or elliptic (3), or oblong (4); herbaceous (17), or chartaceous (2). Leaf-blade venation without cross veins (8), or with obscure cross veins (4), or with distinct cross veins (7).

INFLORESCENCE Inflorescence a panicle (3/7), or composed of racemes (3/7), or comprising only a few spikelets (1/7); exserted (6/7), or embraced at base by subtending leaf (2/7).

Panicle open (2/3), or contracted (1/3).

Racemes single (2/2); bearing 2 fertile spikelets on each (1/2), or 3–5 fertile spikelets on each (2/2).

Spikelets solitary (7/7). Fertile spikelets pedicelled (7/7).

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets (2/7), or 4 fertile florets (4/7), or 5–7 fertile florets (5/7), or 8 fertile florets (4/7), or 9–11 fertile florets (3/7), or 12 fertile florets (2/7), or 13–14 fertile florets (1/7); with diminished florets at the apex (7/7). Spikelets linear (5/7), or lanceolate (1/7), or oblong (1/7); laterally compressed (7/7); 10–29.71–55 mm long; breaking up at maturity (7/7); disarticulating below each fertile floret (7/7). Rhachilla internodes brief up to lowest fertile floret (6/7), or elongated between glumes (1/7); definite (7/7); glabrous (3/7), or pubescent (4/7), or pilose (1/7). Floret callus pubescent (1/2), or pilose (1/2).

GLUMES Glumes two (6/7), or several (1/7); persistent (7/7); shorter than spikelet (7/7). Lower glume lanceolate (5/5); 0.5–0.65–0.8 length of upper glume; chartaceous (5/5); without keels (5/5); 5 -veined (2/2), or 6–9 -veined (1/2). Lower glume surface without pits (7/7); glabrous (5/7), or puberulous (1/7), or pubescent (1/7). Lower glume apex acute (3/4), or acuminate (1/4). Upper glume lanceolate (4/6), or elliptic (1/6), or oblong (1/6); 1 length of adjacent fertile lemma; chartaceous (5/5); without keels (5/5); 5–6 -veined (1/2), or 7–9 -veined (2/2). Upper glume surface glabrous (5/7), or puberulous (1/7), or pubescent (1/7). Upper glume apex acute (4/5), or acuminate (1/5).

FLORETS Fertile lemma lanceolate (1/7), or oblong (1/7), or ovate (7/7); chartaceous (7/7); without keel (7/7); wingless (7/7); 9 -veined (2/3), or 10–11 -veined (1/3), or 17–23 -veined (1/3). Lemma surface unwrinkled (7/7); without grooves (7/7); glabrous (4/7), or puberulous (2/7), or pubescent (2/7). Lemma margins eciliate (5/7), or ciliate (2/7). Lemma apex acute (1/5), or acuminate (4/5); muticous (7/7), or mucronate (1/7), or awned (1/7); 1 -awned (1/1). Palea 0.9–0.95–1 length of lemma; membranous (6/7), or chartaceous (1/7); 2 -veined (2/3), or 8–10 -veined (1/3). Palea keels eciliate (1/7), or ciliolate (2/7), or ciliate (4/7). Palea surface glabrous (5/7), or pubescent (2/7). Palea apex entire (2/2). Apical sterile florets resembling fertile though underdeveloped (7/7).

FLOWER Lodicules 3 (7/7); glabrous (2/7), or ciliate (5/7). Anthers 3 (7/7), or 4 (1/7). Stigmas 2 (1/7), or 3 (6/7). Ovary glabrous (4/5), or pubescent on apex (1/5).

FRUIT Caryopsis with adherent pericarp (7/7); oblong (1/2), or ovoid (1/2); apex unappendaged (2/2).

DISTRIBUTION Europe (1), or Africa (1), or Temperate Asia, or Tropical Asia (2), or Australasia (2).

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