Aristida spiciformis Elliot
Family: Poaceae
Aristida spiciformis image
Mary Keim  

Plants perennial; cespitose. Culms 45-100 cm, unbranched or sparingly branched. Leaves cauline; sheaths shorter than the internodes, glabrous except for occasional hairs at the summit; collars glabrous, or with a few pilose hairs at the sides; ligules about 0.5 mm; blades 12-28 cm long, 1-3 mm wide, usually folded or loosely involute, light yellow-green, glabrous abaxially, puberulent adaxially. Inflorescences dense panicles, (3)8-24 cm long, 2-4 cm wide, somewhat spirally twisted in age; nodes glabrous or strigillose, hairs about 0.1 mm; primary branches 2-4 cm, tightly appressed, without axillary pulvini, with 6-10 spikelets per branch. Glumes lanceolate, 1-veined; lower glumes 3.5-4.5 mm, abruptly contracted to a 4-12 mm awn; upper glumes 7-10 mm, gradually narrowed to a 10-12 mm awn; calluses about 2 mm; lemmas 5-6 mm, dark brown or purplish, terminating in a straight or twisted beak 7-30 mm long, about 0.2 mm wide, beak often disarticulating, no obvious zone of articulation developed, junction of the beak and awns sometimes evident; awns usually unequal, strongly curved and twisted at the base, straight distally, sometimes disarticulating at maturity; central awns (10)20-30 mm; lateral awns 10-20(25) mm, at least 1/2 as long as and evidently thinner than the central awns; anthers 3, about 1 mm, brown. Caryopses 4-5 mm, including the delicate style column. 2n = unknown.

Aristida spiciformis grows in pine savannahs, pine flatwoods, pine-oak sandhills, and oak woods, frequently being associated with Pinus palustris. It is a primary fire carrier in these habitats. Its range includes Cuba and Puerto Rico as well as the southeastern United States.

Aristida spiciformis image
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Aristida spiciformis image
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Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Kathy M. Davis, University of Florida Herbarium  
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
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Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
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Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
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Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Kathy M. Davis, University of Florida Herbarium  
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image
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Aristida spiciformis image
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Aristida spiciformis image
Aristida spiciformis image
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Aristida spiciformis image
Aristida spiciformis image
Aristida spiciformis image