Sporobolus indicus |
Sporobolus pyramidatus |
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rattail smutgrass, smut grass |
Madagascar dropseed, whorled dropseed |
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Habit | Plants perennial; cespitose, with tough fibrous roots, not rhizomatous. | Plants annual, or short-lived perennials flowering in the first year; cespitose, not rhizomatous. |
Culms | 30-100 (120) cm. |
7-35(60) cm, erect or decumbent. |
Sheaths | usually keeled below, glabrous; ligules 0.2-0.5 mm; blades (6)10-30(50) cm long, 1-5 mm wide, flat, glabrous on both surfaces. |
rounded below, margins and apices hairy, hairs to 3 mm; ligules 0.3-1 mm; blades 2-12(20) cm long, 2-6 mm wide, flat, abaxial surface glabrous, adaxial surface scabridulous, sometimes sparsely hispid, margins ciliate-pectinate. |
Panicles | 20-35(50) cm long, 0.3-2.2(3) cm wide, contracted, narrow, sometimes included in the uppermost sheath; primary branches 0.4-2.5(5) cm, appressed or spreading to 40° from the rachis, as long or longer than the adjacent internodes; secondary branches appressed, spikelet-bearing to near the base; pulvini glabrous; pedicels 0.1-1.8 mm, appressed. |
4-15(18) cm long, 0.3-6 cm wide, open (contracted when immature), pyramidal; lower nodes with 7-12(15) branches; primary branches 0.5-4.5 cm, spreading 30-90° from the rachis, with elongated glands, without spikelets on the lower 1/3 – 1/2, secondary branches appressed; pedicels 0.1-0.5 mm, appressed. |
Spikelets | 2-2.6(2.7) mm, plumbeous to light brownish. |
1.2-1.8 mm, plumbeous or brownish, often secund along the branch. |
Glumes | subequal, ovate or obovate, membranous; lower glumes 0.5-1 mm, often without midveins; upper glumes 0.8-1.6 mm, 1/2 - 2/3 as long as the florets, acute to obtuse, entire; lemmas 1.8-2.6(2.7) mm, ovate, membranous, glabrous, acute or obtuse; paleas 1.9-2.4 mm, ovate, membranous, glabrous; anthers 3, 0.5-1.1 mm, white, sometimes purple-tinged. |
unequal, ovate to obovate, membranous; lower glumes 0.3-0.7 mm, without midveins; upper glumes 1.2-1.8 mm, at least 2/3 as long as the florets, often longer; lemmas 1.2-1.7 mm, ovate to elliptic, membranous, glabrous, acute; paleas 1.1-1.6 mm, ovate to elliptic, membranous, glabrous; anthers 0.2-0.4 mm, yellowish or purplish. |
Fruits | 1-1.2 mm, quadrangular, laterally compressed, reddish-brown, truncate. |
0.6-1 mm, obovoid, faintly striate, light brownish. |
2n | = 18, 24, 36. |
= 24, 36, 54. |
Sporobolus indicus |
Sporobolus pyramidatus |
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Distribution |
AL; AR; CA; FL; GA; IL; KY; LA; MD; MI; MO; MS; NC; NJ; NY; OK; OR; PA; SC; TN; TX; VA; HI; PR; Virgin Islands
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AR; AZ; CO; FL; IL; KS; LA; MD; MO; NE; NM; NY; OK; PA; TX; UT; HI; PR; Virgin Islands
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Discussion | Sporobolus indicus is a pantropical species. It commonly grows in disturbed places and open areas such as roadsides, pastures, and lake shores. In the Flora region, it is found on sandy or clay soils and is associated with many plant communities. The spikelets and upper leaves are often covered with hyphomycetous fungi (Bipolaris spp.); hence the common name of "smutgrass". (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Sporobolus pyramidatus is native to the Americas, extending from the southern United States to Argentina. It grows in disturbed soils, roadsides, railways, coastal sands, and alluvial slopes in many plant communities, at elevations from 0-1500 m. Morphologically, it is very similar to the Eastern Hemisphere S. coromandelianus (Retz.) Kunth, suggesting that they are closely related. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 25, p. 122. | FNA vol. 25, p. 119. |
Parent taxa | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Sporobolus | Poaceae > subfam. Chloridoideae > tribe Cynodonteae > Sporobolus |
Sibling taxa | ||
Synonyms | S. poiretii | S. pulvinatus, S. patens, S. argutus |
Name authority | (L.) R. Br. | (Lam.) Hitchc. |
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