1 1 i_ ADDITIONS AND CORRECTIONS 



I '.< 



.-,<! in consequence hereof the species should be known respectively as 

 f<illo\\s: 1. Airacurtifolia (Scribn.) Rydb. n. comb., 2. A. alpicola Rydb. 

 n. comb., 3 A. caespitosa L., A. pungens Rydb. n. comb., A. atro- 

 purpurea \Yahl., A. elongata Hook., A. VaseyanaRydb, n. n. (not A. 

 riliiitii Spreng.), and A. danthonioides Trin. 



(':; After I). ititi'i'itir.<lia insert: 



4a. Danthonia Cusickii (Williams) Hitchc. Closely resembling 

 /;. intermedia, but sheath glabrous, panicle more open, spikelets 15-20 

 nun. long, the lobes of the lemma acuminate rather than awn-tipped. 

 Meadows: Ore. Mont. Ida. Jl Au. 



(':; At'KT D. calif ornica insert: 



Danthonia americana Scribn. Stem 2-4 dm. high, densely cespitose; 

 slieaths short, somewhat inflated, retrorsely pilose, the hairs with pustulate 

 bases, long-bearded at the throat; stem-leaves 3-7 cm. long, 1-2 mm. wide, 

 mostly involute, the lower sparingly pilose; rachis and branches of the 

 inflorescence puberulent; spikelets 1-4, 12-18 mm. long, on spreading 

 peduncles; glumes at least equaling the florets, lanceolate, acuminate, 

 7-9-nerved; body of the lemma 6-8 mm. long, glabrous on the back, 

 villous-ciliate to about the middle, abruptly 2-toothed, the teeth bristle- 

 like, 4-6 mm. long; awn twisted below, 7-9 mm. long. Meadows: Calif. 

 -B. C (Black Hills) Wyo. Je Au. 



77 Before P. triflora insert: 



19a. Poa trivialis L. Perennial; stem erect; decumbent at the base, 

 3-10 dm. high, scabrous below the panicle; blades and sheath retrorsely 

 scabrous | ligules 4-6 mm. long; panicle 6-15 cm. long; spikelets 2-3-flowered, 

 3 mm. long; lemma strongly nerved, pubescent on the keel only. Moist 

 meadows and lawns: Que. La. S. C.; Denver, Colo.; adv. or nat. from 

 Kur. My Au. 



77 For P. triflora Gilib. substitute Poa palustris L. 

 84 After P. tcnui folia insert: 



4. Panicularia maritima (Huds.) Parl. Perennial, with a slender 

 creeping rootstock; stem 3-5 dm. high; leaf-blades flat or involute, some- 

 what pungent; panicle 8-12 cm. long, the lower branches in pairs, at 

 first appressed, then spreading; spikelets 3-8-flowered, 6-12 mm. long; 

 lemma obtuse, 3-4 mm. long. Salt marshes: Greenl. R. I. S. D. 

 (Black Hills); Alaska-Wash; native of Eurasia. Jl Au. 

 93 After A. Scribneri insert: 



la. Agropyron saxicola (Scribn. & Smith) Piper. A densely cespitose 

 perennial; stem about 5 dm. long, puberulent; sheaths short-pilose, 

 ligule very short; leaf -blades 1-2 dm. long, long-attenuate, 3-4 mm. wide; 

 strongly striate, pilose; spike 5-10 cm. long, the rachis readily breaking 

 up; spikelets solitary or rarely in pairs, 2-5- flowered, 1.5 cm. long, exclusiveof 

 thevi\\ us; glumes 1-3-nerved, about 6 mm. long, lanceolate, the awns 1.5-2 

 cm. long; body of the lemma about 1 cm. long, smooth or slightly scabrous 

 near t he apex, lanceolate, the awn 2-2.5 cm. long. Ehjmus saxicola Scribn. 

 A: Smith. Rocky places: Wash. Ida. Au. 

 95 After A. Smithii insert: 



19a. Agropyron repens (L.) Beauv. Perennial, with a long creeping 



rootstock; stem -12 dm. high; leaf -blades 1-3 dm. long, scabrous or 



sparingly pilose above, smooth beneath; spikes 5-15 cm. long; spikelets 



-7-flowered, 1-1.5 cm. long, nearly terete; glumes 5-7-nerved, 8-10 



mm. long, acuminate or awn-pointed; lemma smooth. Waste places: 



-Alta.- -Tex.--Fla.; Pacific Coast; nat. from Eur. Jl S. 

 98 After *s'. Idticvolutiini insert: 



la. Sitanion Hansoni (Scribn.) J. G. Smith. Glabrous perennial; 

 stem 9-12 dm. high; ligule 1 mm. long, entire; leaf-blades 1-3 dm. long, 



