252 GRAMINEJE. [Bromus. 



+ 



pressed ; the outer valve completely conduplicate, with a sharp keel, the lateral form (being thus doubled) is 

 linear-oblong, with one nerve at the keel, and two very prominent ones on each side ; the apex rather acute, 

 the whole scabrous ; inner valve bifid at the point, prominently two-keeled at the back, the keels scabrous. 



Tab. CCXXXII.— i^'zV/. 1. Spikelet ; /. 2. Glumes ; /. 3. Floret x-^magnified, 



11. F. scahrella; panicula erecta, ratnis patentibus, spiculis 3-4-floris teretibus minute 

 scabrellis, perianthii valvula exteriore 5-nervi in aristam perbrevem acuminata, interiore 

 apice bifida, raarg^inibus inflexis ad flexuras nervosis, foliis plerisque radicalibus angusto- 

 linearibus ad vaginam cito deciduis. (Tab. CCXXXIIL) — F. scabrella, Torr, Mst. 



■ T 



Culmi pedales, erecti, csespitosi, striati, subunifoliati, glabri ; folio anguste lineari-acuminato vix duas uncias 

 longo, vagina longissima sub lente scabriuscula : reliqua folia etiam glabra, pleraque radicalia, membranaceo- 

 vaginata, angusto-linearia, 3-4 poUicaria, ad vaginas articulata, cito decidua. Panicula composita, 3-4 poUi- 

 caris, erecta; rami patentes, versus apicem spicigeri. Spiculm viridi-purpurere, 3-plerumque 4-florce, ovatte, 

 % unciam longae, extus tactu vel sub lente minute scabrellae. Glumce intequales, acutas, flosculis subduplo 

 breviores, enerves, muticse. T^'/oscm/j tereies ; pcWanM22 valvula exterior quinquenervis, in aristam perbrevem 

 sensim acuminata ; interior lanceolata, plana, marginibus inflexis ad flexuras uninervibus scabris, apice bifida. 



Hae. Alpine districts of the Rocky Mountains. Drummond. — This is a very distinct, and highly peculiar 

 species. There is seldom more than one leaf on the culm. The rest are radical, and have broad mem- 

 branous sheathing bases, from the top of which the blade of the leaf is very deciduous. The texture of the 

 florets is soft and membranaceous. 



^■\ 



Tab. CCXXXIIL — Fig. 1. Spikelet ; ^^ 2. Perianth : — magnijied. 



38. BROMUS. X. 



1, B. purgans, L Rich, in Frankl. \st Journ. ed, 2. App, p, 3. Torr. FL 1. p. 128. 



This appears to me, judging from the specimens before me, to be a species that varies much according to 

 age and locality. In its more usual form the panicle and spikelets very much resemble our Europaean B. 

 erectus; but the great breadth of the hairy leaves will at all times distinguish it. As has been already sug- 

 gested in the Botany of Capt. Beechey's Voyage, p. 1 19., probably the B. pubescens of Muhl,, the B. Cana- 

 densis^ Mich., the B. ciliatus of Linn., and the B.purgans are all vars. of one and the same species. It will 

 be seen in the " Flora of the Northern and Middle United States," how doubtful Dr Torrey himself is about 

 those reputed species. The following are what I should enumerate as vars. In speaking of the hairiness 

 of the florets, I would be understood as alluding to the outer valve of the perianth : the inner is always beau- 

 tifully ciliated at the flexure of the margin. 



r 



m. vulgaris; panicula elongata laxa, spiculis angustis G-S-floris viridibus, flosculis sericeo-villosis. — Hab. 

 Canada to the Saskatchawan. Goldie, Dr Richardson, Red River. Douglas. Columbia. Dr Scouler. — 

 subvar. a, flosculis glabris vel ad nervos tantum rarius ciliatis. — Hab. Fort Norman. Dr Bichardson. 



fi, pallidus ; panicula densa subcorymbosa, spiculis pauUo latloribus magis compressis pallide virentibus 6-7- 

 floris, flosculis marginibus sericeo-villosis. — Hab. Saskatchawan to the Rocky Mountains. Drtimmond, 



y, purpuras cejis ; panicula elongata laxiuscula, spiculis latioribus C-8-floris viridi-purpurascentibus margini- 

 bus praecipue sericeo-villosis. — Hab. Bear Lake to the Arctic sea-coast. Dr Richardson, 



>. hngispicata ; panicula densa subcorymbosa, spiculis latioribus biuncialibus viridi-purpurascentibus mar- 

 ginibus prgecipue sericeo-villosis. — Hab. Rocky Mountains. Dncmmond, 



