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.

Yushania

HABIT Perennial. Rhizomes absent (3), or short (74), or elongated (3); leptomorph (1/76), or pachymorph (75/76). Culms erect (70/73), or geniculately ascending (2/73), or arching (2/73); 30–344.1–5850 cm long; woody; without nodal roots (3/5), or rooting from lower nodes (1/5), or with aerial roots from the nodes (1/5), or with root thorns from the nodes (1/5). Culm-internodes terete. Culm-nodes constricted (1/19), or flush with internodes (9/19), or swollen (10/19); without obvious supra-nodal ridge (3/8), or with distinct supra-nodal ridge (8/8). Lateral branches suffrutescent (11), or dendroid (68). Branch complement one (23/69), or two (13/69), or three (22/69), or several (45/69), or many (11/69); in a horizontal line (2/7), or in an irregular line (5/7); with subequal branches (7/10), or 1 branch dominant (3/10); as thick as stem (1/2), or thinner than stem (1/2). Culm-sheaths persistent (45/59), or tardily deciduous (10/59), or deciduous but leaving a persistent girdle (1/59), or deciduous (6/59); without auricles (45/66), or auriculate (21/66). Culm-sheath blade linear (56/68), or lanceolate (50/68), or triangular (7/68); narrower than sheath (4/4). Leaf-sheath auricles absent (61), or erect (5), or falcate (15). Ligule an eciliate membrane (69), or a ciliolate membrane (11). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades persistent (63), or deciduous at the ligule (16); linear (13), or lanceolate (78), or oblong (5); herbaceous (31), or chartaceous (47), or coriaceous (1). Leaf-blade midrib indistinct (1/3), or evident (1/3), or conspicuous (1/3). Leaf-blade venation without cross veins (2), or with obscure cross veins (17), or with distinct cross veins (60). Leaf-blade margins cartilaginous (1/1).

INFLORESCENCE Inflorescence a panicle (21/23), or composed of racemes (1/23), or comprising only a few spikelets (1/23); terminal (21/23), or terminal and axillary (2/23); subtended by an unspecialized leaf-sheath (22/23), or a spatheole (1/23); exserted (21/23), or embraced at base by subtending leaf (2/23).

Panicle open (17/19), or contracted (2/19).

Racemes single (1/1); bearing 3–7 fertile spikelets on each (1/1).

Spikelets solitary (23/23). Fertile spikelets sessile (1/23), or pedicelled (22/23). Pedicels filiform (2/2).

FERTILE SPIKELETS Spikelets comprising 2–6–14 fertile florets; with diminished florets at the apex (23/23). Spikelets linear (19/23), or lanceolate (4/23); laterally compressed (22/23), or subterete (1/23); 6–30.84–60 mm long; breaking up at maturity (23/23); disarticulating below each fertile floret (23/23). Spikelet callus pubescent (1/1). Rhachilla internodes definite (23/23); glabrous (9/23), or pubescent (9/23), or pilose (5/23). Floret callus pubescent (1/2), or pilose (1/2).

GLUMES Glumes persistent (23/23); shorter than spikelet (23/23). Lower glume linear (1/22), or lanceolate (8/22), or ovate (13/22); chartaceous (8/22), or herbaceous (14/22); without keels (20/21), or 1-keeled (1/21); 0 -veined (1/13), or 1 -veined (2/13), or 2 -veined (1/13), or 3 -veined (8/13), or 4–5 -veined (5/13), or 6 -veined (1/13), or 7 -veined (3/13), or 8–9 -veined (1/13). Lower glume lateral veins absent (3/23), or obscure (1/23), or distinct (20/23). Lower glume surface smooth (22/23), or scabrous (1/23); without pits (23/23); glabrous (20/23), or puberulous (2/23), or pilose (2/23). Lower glume apex obtuse (1/19), or acute (4/19), or acuminate (11/19), or attenuate (1/19), or setaceously attenuate (2/19); muticous (21/22), or mucronate (1/22). Upper glume lanceolate (10/22), or elliptic (1/22), or ovate (11/22); chartaceous (8/22), or herbaceous (14/22); without keels (19/21), or 1-keeled (2/21); 3 -veined (4/17), or 4 -veined (2/17), or 5 -veined (9/17), or 6 -veined (2/17), or 7 -veined (6/17), or 8 -veined (3/17), or 9 -veined (4/17), or 11 -veined (1/17). Upper glume primary vein eciliate (22/23), or ciliate (1/23). Upper glume lateral veins with cross-veins (1/1). Upper glume surface smooth (22/23), or scabrous (1/23); glabrous (20/23), or puberulous (1/23), or pilose (3/23). Upper glume apex obtuse (2/19), or acute (4/19), or acuminate (11/19), or setaceously attenuate (2/19); muticous (19/22), or mucronate (2/22), or awned (1/22); 1 -awned (1/1).

FLORETS Fertile lemma lanceolate (7/23), or elliptic (1/23), or oblong (2/23), or ovate (15/23); chartaceous (7/21), or herbaceous (14/21); without keel (20/22), or keeled (2/22); wingless (23/23); 5–6 -veined (2/18), or 7 -veined (12/18), or 8 -veined (5/18), or 9 -veined (11/18), or 10–11 -veined (1/18). Lemma midvein without distinctive roughness (21/23), or scabrous (2/23). Lemma lateral veins obscure (1/2), or prominent (1/2). Lemma surface smooth (21/23), or asperulous (1/23), or scaberulous (1/23), or scabrous (1/23); unwrinkled (23/23); without grooves (23/23); glabrous (16/23), or puberulous (3/23), or pubescent (2/23), or pilose (2/23). Lemma margins eciliate (18/23), or ciliate (5/23), or pubescent (1/23). Lemma apex obtuse (1/22), or acute (5/22), or acuminate (14/22), or attenuate (2/22), or setaceously attenuate (2/22); muticous (20/23), or mucronate (2/23), or awned (1/23); 1 -awned (1/1). Palea 1 length of lemma; membranous (22/23), or chartaceous (1/23); 2 -veined (1/7), or 4 -veined (1/7), or 5 -veined (2/7), or 6 -veined (3/7), or 7 -veined (1/7), or 8 -veined (2/7), or 9 -veined (1/7). Palea keels smooth (21/23), or scaberulous (1/23), or scabrous (1/23); eciliate (6/23), or ciliolate (12/23), or ciliate (5/23). Palea surface glabrous (17/23), or puberulous (2/23), or pubescent (4/23). Palea apex dentate (9/9); muticous (22/23), or with excurrent keel veins (1/23). Apical sterile florets resembling fertile though underdeveloped (23/23).

FLOWER Lodicules 2 (1/23), or 3 (22/23); membranous (15/15); glabrous (9/23), or ciliate (14/23). Anthers 3 (22/22). Stigmas 2 (9/23), or 3 (15/23). Ovary glabrous (16/16).

FRUIT Caryopsis with adherent pericarp (22/22); linear (1/9), or fusiform (2/9), or ellipsoid (2/9), or oblong (4/9); trigonous (1/1); apex unappendaged (6/6). Embryo 0.2 length of caryopsis. Hilum linear (4/4).

DISTRIBUTION Europe (1), or Africa (3), or Temperate Asia (66), or Tropical Asia (12).

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