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(Last Modified On 10/18/2012)
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(Last Modified On 10/18/2012)
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Genus
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ICHNANTHUS
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PlaceOfPublication
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Ess. Agrost. 56. pI. I2. f. I. 1812.
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Description
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Spikelets paniculate or arranged on one-sided racemes or raceme-like branches; first glume acuminate, often nearly as long as the spikelet; second glume and sterile lemma subequal, pointed beyond the fruit, usually acuminate; fruit acute or subacute, the margins of the lemma usually flat, the rachilla disarticulating at the base of the segment, remaining attached to the fruit as a short stipe, this bear- ing on either side membranaceous appendages adnate to the base of the lemma, the appendages or wings often much reduced or indicated only by scars. Annuals or perennials of varying habit with relatively broad flat blades and terminal and axillary inflorescences.
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Key
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a. Blades 1-6 cm. long, ovate to ovate-lanceolate, thin; plants annual, the culms very slender and rather weak. b. Inflorescences exserted on long slender peduncles, the branches usual- ly spreading; blades 4-10 mm. wide, the margins not undulate; spikelets sparsely pilose. Plants forming dense soft mats -- 1. I. TENUIS bb. Inflorescences short-exserted, or only the terminal long-exserted, the axillary ones usually partly enclosed in the sheaths, the branches ap- pressed; blades 1-2 cm. wide, the margins undulate; spikelets glabrous _ _ - _ --- 2. I. NEMOROSUS aa. Blades, or at least most of them, more than 6 cm. long, relatively firm, plants perennial, the culms stouter, sometimes clambering in brush. b. Blades ovate to ovate-lanceolate, 1.5-3.5 cm. wide; nodes villous; racemes approximate, stiffly ascending, the lower ones 2-4 cm. long 3. I. AXILLARIS bb. Blades lanceolate, 5-15 mm. wide; nodes glabrous or nearly so; racemes relatively distant, the lower ones spreading, as much as 7 cm. long _ - _ - --- - _ - 4. I. PALLENS
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