'20 THIANDRIA DIGYNIA. [CI. 3. 



awnless, even, obtuse, longer than the calyx. Leaves flat. 

 Stipula oblong. 

 Watery places. If.. 5, 6. Stem float. Glumes abrupt, notched. 



** Corolla awned, hairy at the base. 



3. A. ca>spitosa,2\. 1423. (Tufted H.) Panicle spreading. Florets 



about the length of the calyx, abrupt, hairy at the base ; one 

 of them on a hairy stalk. Awn short, from the bottom of the 

 outer valve. 

 Moist, past, and groves. If. 6, 7. About 3 fl, erect. Leaves 

 flat. Pan. large. 



4. A. alpina, A. laevigata, 30. 2102. (Alpine H.) Leaves involute- 



awl-shaped, with smooth sheaths. Panicle rather close and 



upright. Florets the length of the calyx, acute; one of them on a 



smooth stalk. Awn short, from near the top of the outer valve. 



Mount, and sea shores in Scot. If . 5, 6. 18 in., often viviparous. 



5. A.flexuosa, 22. 1519. (Wavy H.) Leaves bristle-shaped. Panicle 



spreading, triple-forked, with wavy branches. Florets about the 

 length of the calyx, acute. Awn from the middle of the outer 

 valve, twisted, longer than the calyx. 

 Rocky mount.lf.7. About If. Pan. loose, shining, capill. copp.-col. 



6. A.canescens, 17. 1190. (Grey H.) Leaves bristle-shaped. Panicle 



rather dense. Florets shorter than the calyx. Awn club-shaped, 

 not longer ; hairy at the joint. 

 Sandy shores. If . 7. About 4 in. Pan. lanceol. Leaves glauc. 



7. A. precox, 18. 1296. (Early H.) Leaves bristle-shaped, with 



angular sheaths. Panicle close, erect. Florets the length of the 

 calyx, both sessile. Awn nearly twice as long, from the base 

 of the valve. 

 Barren gravelly soil. 0. 5, 6. 4 in., pale. Sheaths tumid. Pan. 

 offewfl. 



8. A. caryophyllea, 12. 812. (Silver H.) Leaves bristle-shaped, 



with ribbed sheaths. Panicle triple-forked, spreading. Florets 

 not longer than the calyx, both sessile. Awn twice as long, 

 from above the middle of the valve. 

 Barren gravelly soil. . 7. 4 — 6 in. Pan. capill. Fl. purp. green 

 and ivhite. 



40. HoLCUS. Soft-grass. 



1. H. landtus, 17. 1169. (Meadow S.) Calyx woolly. Lowerfloret 



perfect, awnless ; upper with an arched awn. Leaves downy 

 on both sides. 

 Mead, and past. If. 6, 7. Root fibr. Leaves soft and downy. 



2. H. mollis, 17. 1170. (Creeping S.) Calyx partly naked. Lower 



floret perfect, awnless ; upper with a sharply-bent prominent 

 awn. Root creeping. 

 Fields and groves. If. . 7, 8. Leaves green, slightly downy. Fl. 

 hairy at the base. 



