96 TRIANDRIA. DIGYNIA. psamma* 



6—10 inches long and about an inch in diameter, Rachis sea-- 

 brous. Flowers much compressed. Glumes nearly equalg 

 linear-lanceolate, scabrous on the keel; the inferior 1-nerved ; 

 the superior 3-nerved. Corolla resembling the calyx, sur- 

 rounded ai the base by hairs one third its length; inferior valve 

 longer than the superior, obscurely 5-nerved. Stamens 3; 

 an//rers large, linear, yellow. 5/t//e very short, 3-cleft; stig- 

 mas pectinately plumose. Mctaries longer than the somewhat 

 triangular seed. 

 Hab. On the sea-icoast of New-Jersey and Long-Island, confin- 

 ing, by its long creeping roots, the loose sands of the shores 

 August. This grass is common to most parts of the world. 



15. CRYPSIS. A it on. 



Calyx 2-valved, membranaceous, carinate. Corolla 

 longer than the calyx, which it resembles in substance 

 and form. Stamens 2- — 3. Nectaries 0. Gen. pi. 1710. 

 Nutt.Gen.\.^.4>9. Lam. 111. t.XlAtt 1.2. Roem. 

 ^ Schu It. Gen. 231. Trin. Jgrost. 36. Cryp- 

 SIS et Heleochloa P. de Beauv. t. VI. f. 12. 

 et t. VII. f. 3. Flowers in a dense oblong or cylin- 

 drical spike. 



C, ^irgin^ca J^utt,: spike oblong-cylindrical, thick antj 

 lobed ; culm procumbent and geniculate ; leaves at length 

 involute, rigid, pungent. JSfutt. 1. c. excl. syn. 



Root annual. Culm 6 — 12 inches long, much branched from 

 the base. Leaves at first flat, divaricate, striate, hairy on the 

 upper surface. Sti/iule very short, bearded. S/iikes lateral 

 and terminal, closely surrounded at the base by the inflated 

 sheaths of the 2 uppermost leaves; the terminal spike an 

 inch or more long ; the lateral ones shorter. Calyx a little 

 unequal; the inferior glume shorter; both of them rough on 

 the keel. Valves of the corolla nearly equal, very acute, naked 

 at the base, nerveless. Stamens 2 ? Styles approximated ; 

 stigmas exsert. Seed ovate, rather obtuse. 



Hab. In the suburbs of Philadelphia, where it was first detected 

 by Dr. W. P. C. Bar ton ; the only locality of this. plant yet 

 known. I found it in flower as late as October. Intermediate 

 between C. alopecuroides and aculeata. 



16. ALOPECURUS. L. 



Calyx 2-valved, equal ; glumes generally connate at 

 the base. Corolla 1-valved, utriculate, cleft on one 

 side, awned below the middle. Styles often connate. 

 Gen. pi. 102. Nutt, Gen, I. p, 51. Juss. p. 29, 



