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(Last Modified On 10/16/2012)
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(Last Modified On 10/16/2012)
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Genus
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AXONOPUS
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PlaceOfPublication
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Ess. Agrost. 12, 154. 1812.
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Description
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Spikelets solitary, sessile in two rows on one side of the 3-angled rachis, the back of the fruit turned from the rachis; first glume wanting; second glume and sterile lemma equal, often pointed beyond the fruit; fertile lemma and palea in- durate, the lemma oblong-elliptic, the margins slightly inrolled. Cespitose or stoloniferous perennials, or rarely annuals, with flat or folded, rounded or pointed blades, and few to many slender racemes, digitate or racemose on the common axis.
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Key
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a. Rachis conspicuously hispid with stiffly spreading golden-yellow hairs. b. Rachis winged, 1-2 mm. wide, extended beyond the spikelets, these sunken in hollows of the rachis. c. Plants perennial; sheaths papillose-hispid; inflorescences terminal on the main culm and branches -2. A. CHRYSOBLEPHARIS cc. Plants annual; sheaths glabrous; inflorescences terminal and axillary - -- -- 3. A. APPENDICULATUS bb. Rachis wingless, 0.4-0.7 mm. wide, not extending beyond the spike- lets, these not sunken in hollows of the rachis. Plants perennialh 1. A. AUREUS aa. Rachis glabrous or scabrous. b. Plants annual. Spikelets about 1.3 mm. long - -- 4. A. CAPILLARIS bb. Plants perennial. c. Spikelets 3-3.5 mm. long. d. Blades conspicuously conduplicate, linear, the margins parallel. Fruit with a short tuft of hairs at the tip -9. A. CAESPITOSUS dd. Blades flat or folded only at the base, narrowed toward both ends. e. Second glume and sterile lemma extending well beyond the fruit, the lemma pubescent between the nerves; racemes 2-6 on a relatively short axis; plants cespitose, not stoloniferous- 10. A. CENTRALIS ee. Second glume and sterile lemma scarcely longer than the fruit, glabrous or nearly so; racemes several to numerous in a rather dense inflorescence, as much as 40 cm. long; plants stoloniferous - -------6. A. SCOPARIUS cc. Spikelets 1.7-2.5 mm. long (rarely 3 mm. long in A. cdmpressus). d. Spikelets 1.7-1.8 mm. long, glabrous; blades sparsely ciliate with long hairs- - 7. A. ATER dd. Spikelets 2-2.5 mm. long, pubescent. e. Blades 1-4 mm. wide, densely pubescent on the upper surface toward the base; plants densely cespitose, sometimes tardily stoloniferous; spikelets with a rather prominent tuft of stiff hairs at the tip -- 8. A. PURPUSII ee. Blades 6-10 mm. wide, glabrous; plants freely stoloniferous; spikelets sparsely pubescent on the internerves -5. A. COMPRESSUS
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