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.

Ochlandra

HABIT Perennial. Rhizomes short; pachymorph. Culms erect (8/9), or leaning (2/9); 200–434.8–780 cm long; woody. Culm-internodes terete. Culm-nodes flush with internodes (1/3), or swollen (2/3). Lateral branches dendroid. Branch complement several (1/1); in a horizontal line (1/1); with 1 branch dominant (1/1); thinner than stem (1/1). Culm-sheaths persistent (5/7), or deciduous (2/7); auriculate (4/4). Culm-sheath blade linear (6/8), or lanceolate (3/8). Leaf-sheath auricles absent (4), or erect (1), or falcate (7). Ligule an eciliate membrane (11), or a ciliolate membrane (1). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades persistent (11), or deciduous at the ligule (1); lanceolate, or oblong (3). Leaf-blade midrib evident (2/4), or conspicuous (2/4). Leaf-blade venation without cross veins (10), or with obscure cross veins (1), or with distinct cross veins (1). Leaf-blade margins cartilaginous (3/3).

INFLORESCENCE Synflorescence bractiferous; linear (1), or clustered at the nodes (11); in stellate clusters (4/11), or untidy tufts (7/11); with glumaceous subtending bracts (9), or spathaceous subtending bracts (3); with axillary buds at base of spikelet; leafy between clusters (1/9), or leafless between clusters (8/9).

FERTILE SPIKELETS Spikelets comprising 3–5 basal sterile florets (1/1); 1 fertile florets; with a barren rhachilla extension (1/1). Spikelets lanceolate (6), or ovate (9); subterete; 15–32.89–65 mm long; falling entire.

GLUMES Glumes two (1), or several (11); shorter than spikelet. Lower glume elliptic (1/4), or oblong (1/4), or ovate (2/4); chartaceous (1/1); without keels (1/1); 21–33 -veined (1/1). Lower glume surface without pits; glabrous (11), or hispid (1). Lower glume apex truncate (1/4), or acute (2/4), or acuminate (1/4); muticous (2/4), or mucronate (2/4). Upper glume elliptic (1/11), or ovate (10/11); 40–47 -veined (1/2), or 48 -veined (2/2), or 49–56 -veined (1/2). Upper glume lateral veins with cross-veins (1/1). Upper glume surface glabrous (9), or pilose (2), or hispid (1); with simple hairs (2/3), or tubercle-based hairs (1/3). Upper glume apex acute (8/10), or acuminate (2/10); muticous (3/11), or mucronate (8/11).

FLORETS Fertile lemma oblong (1), or ovate (11); chartaceous; without keel; wingless; 18 -veined (1/4), or 20–29 -veined (1/4), or 30–36 -veined (2/4), or 37–39 -veined (1/4), or 40–48 -veined (2/4), or 49–70 -veined (1/4). Lemma surface unwrinkled; without grooves (11), or with a median groove (1). Lemma margins convolute; covering most of palea; eciliate (11), or ciliate (1). Lemma apex emarginate (1), or acute (7), or acuminate (4); muticous (8), or mucronate (4). Palea not rolled (4), or tightly convolute around flower (8); 1 length of lemma; 12 -veined (1/4), or 15–25 -veined (1/4), or 30–32 -veined (1/4), or 33 -veined (2/4), or 34–48 -veined (1/4); without keels (8), or 2-keeled (4). Palea surface glabrous (11), or pilose (1).

FLOWER Lodicules 1 (1), or 3 (4), or several (7); membranous; glabrous (10), or ciliate (3); 2-toothed (1/1); truncate (1/2), or acute (1/2). Anthers 15–46–120. Stigmas 3–4 (1), or 5 (6), or 6 (3), or 7 (4), or 8 (2), or 9 (1). Ovary with a steeple-like appendage; glabrous (9/9).

FRUIT Caryopsis with fleshy pericarp; oblong (3/7), or ovoid (4/7).

DISTRIBUTION Tropical Asia.

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