Vol. III.] 



APPENDIX. 



503 



[Vol. I: p. 160.] 4a. Agrostis rupestris 

 Allioni. Rock Bent-grass. (Fig. 365a.) 

 Agrostis rupestris Allioni, Fl. Pedera. 2: 237. 1785. 



Culms tufted, 6' or less tall, slender, erect, or 

 decumbent at the base, smooth and glabrous. 

 Sheaths longer than theinternodes; ligule about 

 Yz" long; leaves smooth and glabrous, those on 

 the culm \' or less long, the basal leaves from 

 one-third to one-half as long as the culms; 

 panicle contracted, i f or less long, its axis and 

 branches smooth, the latter erect or nearly so, 

 spikelet-bearing above the middle; spikelets 

 about 1" long; empty scales about equal, 1- 

 nerved, acute, usually purple, hispidulous on 

 the keel; flowering scale shorter, hyaline, den- 

 ticulate at the obtuse or truncate apex, bearing 

 about the middle a dorsal scabrous awn a little 

 over i // long; palet wanting. 



Labrador and the high mountains of Nevada. 

 Also in Europe. Summer. 



jC. [Vol. i: p. 174.] 2a. Danthonia glabra 



Nash. Smooth Wild Oat-grass. (Fig. 398a.) 

 Danthonia glabra Nash, Bull. Torr. Club, 24: 43. 1897. 



Glabrous. Culms erect, tufted, i6 / -28 / tall, slightly 

 roughened j ust below the panicle and puberulent below 

 the brown nodes; sheaths usually shorter than the in- 

 ternodes; ligule densely ciliate with long silky hairs; 

 leaves smooth excepting at the apex, \"-i" wide, erect, 

 those on the sterile shoots 6 / or more long, the culm 

 leaves 2 / ~4 / long; panicle 2 / ~3 / long, contracted; spike- 

 lets, including awns, 9 // -io // long, 5-io-flowered, on 

 hispidulous appressed pedicels; empty scales acumi- 

 nate; flowering scales 2}4 // ~3 // long to the base of the 

 teeth, pilose on the margins below and sometimes spar- 

 ingly so on the midnerve at the base, the remainder of 

 the scale glabrous, teeth, including the awns, i // -i^ // 

 long, the central awn 4^ // -6 // long, more or less 

 spreading. 



In swamps, southern New Jersey to Georgia. May-July. 



Tricuspis albescens Munro; A. Gray, Proc. Phila. 



Acad. Nat. Sci. 1862: 335. Name only. 1863. 

 Triodia albescens Vasey, Bull. U. S. Dept. Agric. Div. 



Bot. 12: Part 2, 33. 189 1. 

 Sieglingia albescens Kuntze; I,. H. Dewey, Contr. U. 



S. Nat. Herb. 2:538. 1894. 



Culms tufted, erect, smooth and glabrous, i2 / -20 / 

 tall, the sterile shoots one- half as long as the culm 

 or more. Sheaths shorter than the internodes, 

 smooth; ligule a ring of short hairs; leaves smooth 

 beneath, roughish above, acuminate, 2^ / -ii / long, 

 i // -2 // wide; panicle dense and contracted, white, 



Sieglingia albescens (Vasey) Kuntze. 

 Sieglingia. (Fig. 422a.) 



White 



-5' 



long, 



%' 



-%' 



ascending, \' or 

 flowered, i"-iy 2 " 

 i-nerved, about 



broad, its branches erect or 



less long; spikelets about 7-1 1- 



long, the empty scales white, 



equal; flowering scales about 



1%" long, 3-nerved, the lateral nerves vanishing be- 

 low the apex, all the nerves glabrous, the midnerve 

 excurrent in a short scabrous point, denticulate 

 and irregularly and obscurely lobed at the truncate 

 .apex,, short- pilose on the callus. 



Prairies, Kansas to Texas. Aug.-Sept. 



