| Taxon | Illustrator ⠉ | |
|---|---|---|
 | Heteropogon contortus Heteropogon melanocarpus | Hana Pazdírková Linda A. Vorobik Hana Pazdírková Linda A. Vorobik |
Plants annual or perennial; cespitose. Culms 20-200 cm, simple or branched. Leaves sometimes aromatic and smelling of lemon oil or citronella; sheaths keeled, sometimes with a row of glandular depressions on the keel; ligules membranous, glabrous or ciliate. Inflorescences terminal and axillary; peduncles usually with 1 rame, sometimes with several in a digitate cluster; rames with 3-10 homogamous, unawned, sessile-pedicellate spikelet pairs on the lower 1/4 - 2/3 and heterogamous, awned, sessile-pedicellate spikelet pairs distally, axes slender, without a translucent median groove; disarticulation in the rames, beneath the sessile spikelets of the heterogamous spikelet pairs, sometimes also below their pedicellate spikelets. Homogamous spikelet units sterile or staminate; calluses poorly developed; glumes membranous, many-veined, keels winged above. Heterogamous spikelet units: sessile spikelets bisexual, terete; calluses 1.5-3 mm, sharp, antrorsely strigose, hairs golden brown; glumes coriaceous, pubescent, concealing the florets; lower glumes enclosing the upper glumes, obscurely 5-9-veined; upper glumes sulcate, 3-veined; lower florets sterile, reduced to a hyaline lemma; upper florets bisexual, lemmas with conspicuous, geniculate awns; awns 5-15 cm, with hairs. Caryopses lanceolate, sulcate on 1 side. Pedicels short, free of the rame axes, not grooved; pedicellate spikelets sterile or staminate, larger than the sessile spikelets; calluses long, glabrous, functioning as pedicels; glumes membranous, many-veined, keels winged above, x = 10, 11.
Distribution
N.Mex., Tex., Calif., Puerto Rico, Virgin Islands, Ala., N.C., S.C., Pacific Islands (Hawaii), Ga., Ariz., Fla.
Discussion
Heteropogon is a pantropical genus of eight to ten species. Two species grow in the Flora region; probably both are introduced. Many grow well on poor soils.
Selected References
None.
Lower Taxa
Key
| 1 | Glumes of the pedicellate spikelets of the heterogamous spikelet units without glandular pits; plants perennial | Heteropogon contortus |
| 1 | Glumes of the pedicellate spikelets of the heterogamous spikelet units with a row of glandular pits along the midvein; plants annual | Heteropogon melanocarpus |
"decumbent" is not a number.