MACLOSKIE: GRAMINE^E. 177 



22. S. VAGINATA Phil. 



(Pappophora.) Glumes violaceous-green, with hyaline borders, sub- 

 equal, 14 mm. long. Callus glabrous. Floral glume 16 mm. long, 

 white pilose ; palea little shorter, glabrous. Awn 26-30 mm. long, with 

 long white basal pappus. Plants cespitose, with rigid glabrous culms 

 enclosed in the leaf sheaths ; lamina convolute, filiform, glabrous, smooth. 

 Panicle long, contracted, ensheathed. 



Allied to S. speciosa. 



(Chili, near Aconcagua); Patagon., Chubut, near Cabo Raso; "these 

 differ from the description by having the awns villous as far as the joint, 

 and by the floral glume 6, not 16 mm. long." (Speg.) 



1 6. ORYZOPSIS Mich. 



Stipece. Cespitose grasses, sometimes tall, leaves plane or convolute. 

 Panicle terminal, lax, narrow or effuse. Spikelets i -flowered, rachilla 

 jointed above the lower glumes, callose under the flower, not produced 

 above the flower, which is hermaphrodite and terminal. Glumes 3, the 2 

 lower, below the articulation, persistent, subequal, empty. The flori- 

 ghtme broad, enclosing the flower and the 2-carinate palea, apically obtuse 

 or truncate, its terminal awn often excentric, geniculate, and twisted 

 below; it and its awn very caducous. Stamens 3. Grain oblong, en- 

 closed in the glume, free. 



Differs from Stipa by its broad floriglume, often oblique. 



Species 24, in north temperate regions of both hemispheres and S. Amer. 



O. NAPOSTAENSIS Speg. 



Glumes mediocre, lanceolate, twice as long as the flower, 3~5-nerved, 

 violascent. Flower cylindraceous, chestnut to umber-hued. Crown an- 

 nulate-cupuliform, short ; pappus velvet-ciliolate. Anthopodium (callus] 

 - 4 times diameter of flower, rufous-villous. Awn 6-9 times as long as the 

 flower, jointed below the middle, and at lowest fourth, persisting. Leaves 

 capillary-setaceous, smooth. Panicle depauperate, nutant 

 (Buenos Aires); N. Patagon., dry meadows near Carmen. 



O. NAPOSTAENSIS BRACHYSPERMA Speg. 



Small, contracted, cespitose. Leaves setaceous, short, 25-50 mm., 

 often somewhat circinate. Glumes small. Awns thickish, the upper 



