GEAMINBAE (GRASS FAMILY) 



137 



1.5-3 dm. long, the slender branches ascending, somewhat contracted after 

 flowering; spikelets 5 mm. long; glumes scabrous, unequal, the second as long 

 as the scabrous lemma whicb bears a minute awn or is 

 sometimes awnless; palea 1-nerved. — Moist woods and 

 shaded swamps ; N. S. to Ont. and south w. Aug., Sept. 

 Fig. 113. 



2. C. latifdlia (Trev.) Griseb. Similar to the preced- 

 ing ; blades 1.5-2.5 dm. long., 1-1.5 cm. wide, rarely nar- 

 rower, scabrous; panicle 1.5-3.5 dm. long, the flexuous 

 capillary branches spreading or drooping; spikelets 4 mm. 

 long; glumes scabrous, subequal, and about equaling the 

 scabrous short-awned lemma ; palea 2-nerved, the nerves 

 c'ose together. (C. pendula Trin.) — Damp woods, Nfd. to B. C, s. to N. E, 

 H. Y., the Great Lake region, and westw.; also on mts. of N. C. (Eu.) 



113. C. arundinacea. 

 Spikelets x 2%. 



39. aIrA L. Hair Grass 



Spikelets 2-flowered, both flowers perfect ; glumes thin, somewhat scarious, 

 subequal, acute, awnless, longer than the approximate florets ; lemmas bidentate, 

 awned on the back or the lower awnless ; palea a little shorter than the lemma ; 

 grain included in the slightly indurated lemma and palea, and usually adherent 

 to them. — Delicate annuals. (An ancient Greek name for Darnel.) 



1. A. OARYOPHTLLtA L. Culms solitary or few, slender, erect, 8-30 cm. high ; 

 blades short, setaceous ; panicle open, the silvery shining spikelets clustered, 

 toward the ends of the spreading capillary branches, 3 m»?i. 

 long, nearly as broad ; lemma of both florets with a geniculate 

 awn 3-4 mm. long from below the m,iddle, the teeth of the apex 

 setaceous. — Waste places, Nantucket to O., and south w. 

 June. (Nat. from Eu.) Fig. 114. 



i/S. A. capillAris Host. Similar to the preceding ; panicle 

 R ■v^l^i'^-i *" ''^°'^^ diffuse ; spikelets scattered at the ends of the branches, 

 Bpikeiet X 3. 2 g ^^^^ j^^^p, . jg^^^, ^y igyj^f floret awnless or with a minute 



awn just below the apex, the teeth of which are short ; lemma 

 of upper floret bearing a geniculate awn 3 mm. long from below the middle, teeth 

 of apex setaceous. — On the coast, Va., and southw. May, June. (Nat. from Eu.) 

 %^S. A. PKAtoox L. Culms tufted, 0.5-20 cm. high, slender, erect or lower 

 nodes geniculate ; sheaths slightly inflated ; blades setaceous ; panicle narrow 

 and dense, the short branches erect, 1-3 cm. long ; spikelets yellowish, shining, 

 ,3.5-4 mm. long ; lemmas of both florets bidentate at apex, and bearing a genicu- 

 late awn 2-4 mm. long from below the middle, the awn of lower floret shorter 

 than that of the upper. — Sandy fields, N. J. and Del. to Va. May-July. ^Nat. 

 from Eu.) 



40. h6lcus l. 



Spikelets 2-flowered, articulated below the glumes ; the lower floret perfect, 

 raised on a curved stipe, awnless ; the upper floret staminate (rarely perfect), 

 its lemma bearing a dorsal awn from below the apex ; glumes 

 thin, subequal, compressed, boat-shaped, longer than the 

 florets ; lemmas somewhat indurated, Ijpat-shaped ; paleas 

 thin, nearly as long as the lemmas. — Perennials with flat 

 leaves and densely flowered terminal panicles. (A name used 

 by Pliny for a kind of grass, from 6X/c6s, attractive.) 

 (^ H. LANXxns L. (Velvet Grass.) Entire plant grayish, 

 velvety-pubescent; culms erect, 3-6 dm. high; leaves 15 cm. 

 long or less, rarely longer, 5-10 mm. wide ; panicle purplish, 

 5-10 cm. long, narrow ; spikelets 4 mm. long, nearly as broad ; 

 glumes villous, hirsute on the nerves, the second broader than 

 the first, 3-nerved ; lemmas ciliate at the apex ; awn of second 



115. H. lanatus. 

 Spikelet x 2%. 

 Same opened X 2^ 



floret hooklike. - 

 'Nat, from Eu.) 



-Moist meadows, N. S. 

 Fig. 115, 



tp 111., and southw. June, July,' 



