GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Pharus lappulaceus

HABIT Perennial; caespitose. Culms erect; 50–100 cm long; 3 mm diam. Culm-internodes solid. Ligule a ciliolate membrane; 1–1.5 mm long. Leaf-blade base with a false petiole. Leaf-blades inverted; elliptic; 11–22 cm long; 35–45 mm wide. Leaf-blade venation slanting obliquely from midrib; with distinct cross veins. Leaf-blade apex acute.

INFLORESCENCE Monoecious; with male and female spikelets in the same inflorescence. Inflorescence a panicle.

Panicle open; ovate; 11–22 cm long; contracted about primary branches. Primary panicle branches spreading; simple. Panicle axis bearing deciduous branches. Panicle branches stiff; pubescent; with hooked hairs.

Sexes mixed. Spikelets appressed; in pairs, or in threes. Fertile spikelets sessile; 1–2 in the cluster. Male spikelets pedicelled; 1 in a cluster. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; straight; subterete; 8–12 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 4.2–5.8 mm long; 0.8–0.9 length of upper glume; scarious; dark brown; without keels; 7 -veined. Lower glume apex acute. Upper glume lanceolate; 5–6.5 mm long; 0.5–0.66 length of adjacent fertile lemma; scarious; dark brown; without keels; 7 -veined. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma elliptic; subterete; 8–12 mm long; coriaceous; without keel; 7 -veined. Lemma lateral veins obscure. Lemma surface pubescent; hairy all along; with hooked hairs. Lemma margins involute; interlocking with palea keels. Lemma apex acute; with a conical beak; with this appendage 1–1.5 mm long. Palea linear; 1 length of lemma; 2 -veined.

FLOWER Lodicules absent. Anthers 6; 0.9–1.1 mm long. Stigmas 3; pubescent.

FRUIT Caryopsis with adherent pericarp; oblong.

MALE Male spikelets similar to female but less developed; 1 flowered; separately deciduous; lanceolate; 2.5–2.7 mm long. Male spikelet glumes 2. Male spikelet lemma 3 -veined.

DISTRIBUTION North America: Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America.

NOTES Phareae. =Pharus glaber. Pohl.

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