Diandrolyra tatianae

HABIT Perennial; caespitose. Rhizomes short. Culms erect, or geniculately ascending; 40–50 cm long. Culm-internodes hollow. Culm-nodes brown; pubescent. Leaves cauline; 4–6 per branch. Leaf-sheaths ribbed; glabrous on surface. Ligule an eciliate membrane; white. Leaf-blade base broadly rounded; symmetrical; with a brief petiole-like connection to sheath; petiole 0.2 cm long; petiole pubescent. Leaf-blades linear, or elliptic; 10–16 cm long; 10–40 mm wide; mid-green, or mid-green and purple; concolorous, or discolorous with last colour beneath (purple below). Leaf-blade midrib evident. Leaf-blade surface glabrous. Leaf-blade margins smooth. Leaf-blade apex acute.

INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Synflorescence on a specialized culm bearing a single leaf-blade. Inflorescence composed of racemes. Peduncle pubescent above.

Racemes 1; single; unilateral; 3 cm long; bearing few fertile spikelets; bearing 6–8 fertile spikelets on each. Rhachis flattened; glabrous on margins.

Sexes mixed. Spikelets in pairs. Fertile spikelets pedicelled; 1 in the cluster. Male spikelets sessile; 1 in a cluster. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; 6.1–6.2 mm long; 2–3 mm wide; falling entire. Spikelet callus square; 1 mm long; pubescent.

GLUMES Glumes similar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 5.4 mm long; 1 length of upper glume; herbaceous; without keels; 9 -veined. Lower glume lateral veins with cross-veins. Lower glume surface pubescent; hairy on veins. Lower glume apex acute. Upper glume ovate; 5.2 mm long; 1 length of adjacent fertile lemma; herbaceous; without keels; 7–9 -veined. Upper glume lateral veins with cross-veins. Upper glume surface pubescent; hairy on veins. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma ovate; 5 mm long; 2 mm wide; indurate; pallid; without keel; 5 -veined. Lemma margins flat. Lemma apex acute; scabrous. Palea 1 length of lemma; indurate; 2 -veined.

FLOWER Lodicules 3; free (male), or united (female); fleshy; truncate. Anthers 2; 1 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; obovoid. Hilum linear; 0.75 length of caryopsis.

MALE Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 5 mm long; glabrous. Male spikelet glumes absent (except terminal spikelet). Male spikelet lemma 3 -veined; muticous.

DISTRIBUTION South America: Brazil.

NOTES Olyreae. Soderstrom 1994.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.