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Project Name Data (Last Modified On 10/18/2012)

Flora Data (Last Modified On 10/19/2012)
PlaceOfPublication Sp. P1. 55. 1753.
Description Spikelets paniculate or sometimes short-pedicelled in one-sided racemes; first glume minute to nearly as long as the spikelet; second glume and sterile lemma nearly equal, similar, the lemma often enclosing a hyaline palea and sometimes a staminate flower; fertile floret indurate, the nerves obsolete, the margins of the lemma inrolled, firmly enclosing the palea.
Note Annuals or perennials, exceedingly variable in habit, size, and appearance.
Key a. Basal blades distinctly different from the culm blades, forming winter rosettes; culms at first simple, finally sparingly to freely branching. b. Plants light green, the blades of the rosette forming small soft dense cushions; culms 10-20 cm. high, branching from the base; blades conspicuously ciliate - __ - - - _ - _ - 1. P. STRIGOSUM
bb. Plants dark green or olivaceous, the basal blades not forming dense soft cushions; culms 20-100 cm. high, branching from the middle and upper nodes; blades not conspicuously ciliate or only near the base. c. Ligule obsolete or nearly so; blades glabrous or nearly so with firm, white margins, ciliate near the base; culms sparingly branch- ing -------- - ---- --- _ _____ _________ 2. P. SPHAEROCARPON
cc. Ligule 2-4 mm. long, ciliate; blades densely pubescent or villous; culms finally freely branching, the blades and panicles of the branches reduced. d. Blades velvety-pubescent; spikelets 1.8-1.9 mm. long; culms mostly more than 70 cm. long from a creeping base -3. P. VISCIDELLUM
dd. Blades not velvety; spikelets 1.9-2 mm. long; culms less than 5 0 cm. long _ - _ _--- __ 4. P. OLIVACEUM
aa. Basal blades similar to the culm blades.
b. Plants annual.
c. Fruit transversely rugose; spikelets short-pedicelled along the raceme-like branches. d. Spikelets glabrous, brown, 2.5-3 mm. long -_ - 7. P. FASCICULATUM
dd. Spikelets densely pubescent, 3.5-4 mm. long - _ - _ 8. P. MOLLE
cc. Fruit smooth; spikelets in open panicles. d. First glume one-fourth as long as the spikelet, obtuse or sub- acute. Glabrous, rather succulent, subaquatic annual - 9. P. CHLOROTICUM
dd. First glume at least half as long as the spikelet.
e. Culms erect; spikelets at least 2 mm. long; blades elongate.
f. Culms robust, 1.5 m. or more high; spikelets 2 mm. long- 12. P. HIRSUTUM
ff. Culms slender, not more than 75 cm. high.
g. Spikelets 2.2 mm. long; panicles terminal and axillary, crowded, implicate - - _ - 11. P. CAYENNENSE
gg. Spikelets 2.5-3.3 mm. long; panicles not implicate - 10. P. HIRTICAULE
ee. Culms decumbent-spreading; spikelets 1.5 mm. long; blades ovate or elliptic. f. Panicles 2-5 cm. long, with delicate flexuous, spreading or reflexed branches; spikelets pyriform, glabrous- 25. P. PYRULARIUM
ff. Panicles 5-20 cm. long, the branches delicate but not flexuous, ascending to spreading; spikelets elliptic, pubes- cent _ - _ _ - _ - _ - _ - 27. P. TRICHOIDES
bb. Plants perennial. c. Spikelets short-pedicellate along one side of the panicle branches, forming spike-like or 1-sided racemes. d. Fruit transversely rugose.
e. Culms slender, less than 1 m. long; nodes glabrous- - 5. P. GEMINATUM
ee. Culms coarse, as much as 6 m. long; nodes bearded - 6. P. PURPURASCENS dd. Fruit smooth, not rugose. e. Blades lanceolate or ovate-lanceolate.
f. Spikelets sparsely pilose, the sterile lemma with two crateri- form glands on the back - -- - 16. P. PULCHELLUM
ff. Spikelets glabrous, glandless. g. Blades 1-5 cm. long; racemes few to several, scarcely crowded ----- - - - - - 17. P. STOLONIFERUM
gg. Blades 5-11 cm. long; racemes numerous, crowded - 18. P. FRONDESCENS
ee. Blades linear, often elongate, frequently cordate at the base.
f. Spikelets nearly sessile, densely arranged along one side of the pilose rachis.
g. Culms as much as 2 m. high; panicles 25-45 cm. long 19. P. MILLEFLORUM
gg. Culms not more than 1 m. high; panicles 5-15 cm. long. 20. P. PILOSUM
ff. Spikelets in part on short branchlets on the lower side of the rachis. g. Blades 20-25 cm. long, 1.5-3 cm. wide; panicles 20-40 cm. long _- - _ - _ -24. P. STAGNATILE
gg. Blades not more than 15 cm. long; panicles 5-30 cm. long.
h. Nodes pubescent - - _ - _ ___21. P. POLYGONATUM
hh. Nodes glabrous. i. Blades narrowed toward the base -22. P. LAXUM
ii. Blades somewhat cordate at the base - -- 23. P. BOLIVIENSE
cc. Spikelets in open or contracted panicles but not on 1-sided racemes.
d. Fruit transversely rugose. Culms in large coarse clumps-- 36. P. MAXIMUM
dd. Fruit not rugose.
e. First glume much less than one-fourth as long as the spikelet.
f. Sheaths glabrous on the back, densely pubescent on the collar; panicles mostly 4-8 cm. long; blades 5-12 mm. wide 30. P. ARUNDINARIAE
ff. Sheaths pilose or papillose-pilose; panicles 10-15 cm. long; blades 1-2.5 cm. wide - - __ - __ - - 31. P. SCHIFFNERI
ee. First glume more than one-fourth as long as the spikelet.
f. Blades as much as 1 m. long and 6 cm. wide- 38. P. GRANDE
ff. Blades much smaller. g. Fruit crested at the apex. Spikelets 5.5-6 mm. long- 39. P. ZIZANIOIDES
gg. Fruit not crested.
h. Panicles narrow and few-flowered. Culms erect, wiry- 34. P. STENODOIDES
hh. Panicles many-flowered. i. Panicles 40-60 cm. long, the elongate branches in verticils _ - _ - _-- 37. P. MERTENSII
ii. Panicles not more than 30 cm. long, the branches not in verticils.
j. First glume blunt or rounded, seldom subacute, two-thirds as long as the spikelet or more.
k. Spikelets 2 mm. long; panicles all alike, 10- 20 cm. long- - _ 29. P. SELLOWII
kk. Spikelets 2.7-3.5 mm. long; primary panicles open, the secondary narrow, reduced, partly enclosed in the sheath. 1. Plant glabrous or the blades sparsely pilose.32. P. CORDOVENSE
11. Plants velvety pubescent _ - _ 33. P. PANTRICHUM
jj. First glume acute or acuminate, not more, usually less, than two-thirds as long as the spikelet.
k. Spikelets 1.2-1.5 mm. long, the first glume one-fifth as long as the spikelet- 28. P. TRICHANTHUM kk. Spikelets 2.3-4 mm. long.
I. Culms erect, or finally spreading. m. Spikelets glabrous. n. Spikelets 3 mm. long; sheaths promi- nently papillose-hispid -13. P. GHIESBREGHTII
nn. Spikelets 3.5-4 mm. long; sheaths gla- brous -14. P. RIGIDUM
m. Spikelets sparsely hispid. Panicles termi- nal and axillary, implicate, partly en- closed in the sheath -15. P. RUDGEI
ll. Culms straggling.
m. Culms coarse and stout, 2-4 m. long; spikelets 3.2-4 mm. long, glabrous, turgid, gaping; first glume about two-thirds as long as the spikelet- 3 5. P. ALTUM
mm. Culms slender, mostly about 1 m. long; spikelets 2.3-2.5 mm. long, sparsely pilose; first glume about half as long as the spikelet-- 26. P. 5IAENKEANUM
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