Treatment appears in FNA Volume 25. Treatment on page 139.
 TaxonIllustrator 
FNA25 P53 Crypsis pg 141.jpegCrypsis alopecuroides
Crypsis schoenoides
Crypsis vaginiflora
Karen Klitz
Linda A. Vorobik
Karen Klitz
Linda A. Vorobik
Karen Klitz
Linda A. Vorobik

Plants annual; synoecious. Culms 1-75 cm, erect to geniculately ascending, sometimes branching above the base; nodes usually exposed. Sheaths open, often becoming inflated, junction with the blades evident; ligules of hairs; auricles absent; blades often disarticulating. Inflorescences terminal or terminal and axillary, spikelike or capitate panicles subtended by, and often partially enclosed in, 1 or more of the uppermost leaf-sheaths, additional panicles often present in the axils of the leaves below. Spikelets 2-6 mm, strongly laterally compressed, with 1 floret; florets bisexua; disarticulation above or below the glumes. Glumes 1-veined, strongly keeled; lemmas membranous, glabrous, 1-veined, strongly keeled, not lobed, unawned, sometimes mucronate; paleas hyaline, 1-2-veined; lodicules absent; anthers 2 or 3; ovaries glabrous. Fruits oblong, pericarp loosely enclosing the seed and easily removed when wet; hila punctate, x = 8.

Distribution

Wash., B.C., Del., Wis., Idaho, Oreg., Wyo., N.J., N.Y., Pa., Nev., Colo., Calif., Mont., Ill., Ind., Iowa, Ariz., Ont., Mass., Ohio, Utah, Mo., Mich., Vt.

Discussion

Crypsis, a genus of eight species, is native from the Mediterranean region to northern China. Its species tend to occur in moist soils, often in areas subject to winter flooding. The three species found in the Flora region are very plastic in the lengths of their culms and leaves, e.g., the culms of C. schoenoides vary from 2 cm in dry sites to 75 cm under optimal conditions.

Key

1 Spikelets 1.5-2.8 mm long; panicles 7-8 times longer than wide, usually completely exserted from the uppermost sheath at maturity Crypsis alopecuroides
1 Spikelets 2.5-4 mm long; panicles 1-5 times longer than wide, the bases usually enclosed in the uppermost sheath at maturity. 2. Collars glabrous; glumes unequal in length, the margins glabrous; anthers 0.7-1.1 mm long Crypsis scboenoides
2 Collars pilose; glumes subequal, at least the lower glumes pilose on the margin; anthers 0.5-0.9 mm long Crypsis vaginiflora

"decumbent" is not a number.

... more about "Crypsis"
3 +  and 2 +
Barry E. Hammel +  and John R. Reeder +
1 (?) +  and 3 (?) +
multiple +, , +  and single +
keeled +  and rounded +
pseudopetiolate +  and branching +
not fused +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
disarticulating +
pubescent +  and glabrous +
usually linear +  and lanceolate occasionally ovate +
spikelike +
triangular +  and dome--shaped +
sometimes longer +
membranous +
erect +  and geniculately ascending +
1 cm10 mm <br />0.01 m <br /> (75 cm750 mm <br />0.75 m <br />) +
not woody +
Wash. +, B.C. +, Del. +, Wis. +, Idaho +, Oreg. +, Wyo. +, N.J. +, N.Y. +, Pa. +, Nev. +, Colo. +, Calif. +, Mont. +, Ill. +, Ind. +, Iowa +, Ariz. +, Ont. +, Mass. +, Ohio +, Utah +, Mo. +, Mich. +  and Vt. +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
bisexual +  and fertile +
round +  and compressed +
reduced +
shorter or longer +
subtending +
uncinate +
paniculate +  and racemose +
capitate +  and spikelike +
hollow +  and solid +
not absent +
mucronate +, not lobed +  and keeled +
membranous +
sometimes longer +
inconspicuous +
2 +  and 1 +
dry +  and fleshy +
spikelike +
hammel1979a +
inflated +
1 +  and 60 +
compressed +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1 +  and 3 +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Crypsis +
Poaceae tribe Cynodonteae +
membranous +
7 (?) +  and 13 (?) +
aquatic +  and terrestrial +