MACLOSKIE: GRAMINE^E. 183 



^3. Culm 70 cm. Leaves convolute-filiform. Glumes 6 mm., purplish. Awn 



long. antoniana. 



d2. Panicle contracted. Culms 50 cm. 



e. Awn long. Spikelets large. Glumes slightly exceeding the flowers. 



brachyathcra. 

 e2. Awn short. Spikelets small. Glumes 4 times as long as the flowers. 



macranthcra. 

 e$. Awn bent. Spikelets only i mm. long. Floriglume obtuse. Leaves 5 cm. 



long, plane. canina. 



c2. Culm rough, 60 cm., from a creeping rootstock. Leaves linear-lanceolate, retrorsely 



scabrid. Awn long. Palea none. cognata. 



A2. Mostly awnless, sometimes with awns. 



b. Pubescent. Panicle spreading, erect ; spikelets violaceous. Culm jointed at base, glabrous. 



Leaves convolute or subsetaceous, with auricles for ligules. aberrans. 



b2. Scabrous. 



c. Culm 30 cm., glabrous. Panicle exserted, green to purplish-brown, at length con- 

 tracting. Leaves flat, with long ligules. alba. 

 c2. Culm 40 cm. Panicle dense, exserted. 



d. Leaves flat, or involute. Empty glumes subequal. Floriglume truncate, toothed. 



exarata. 



d2. Leaves subsetaceous. Floriglume 4-toothed. Palea shorter or none, tcnuifolia. 

 3. Smooth, varying. Leaves narrow, acute. Panicle strict ; its rays di- to trichotomous. 



moyanoi. 



A$. Acute-awned. All glabrous. Lower 3-4 nodes sheathed. Leaves shortish, plane. Pan- 

 icle spike-like, erect ; rays densely spiculiferous. tehuelcha. 

 A^.. Awnless. 



b. Annual. Culm 30 cm., nodeless above. Sheaths rough. Panicle lax, its rays opposite. 



Glumes straw-colored. serranoi. 



b2. Glabrous perennials. 

 c. Panicle lax. 



d. Panicle naked below. Glumes 3 mm., yellowish-violet ; floriglume slightly shorter. 



fuegiana. 

 d2. Culm 65 cm., naked above. Rays in 2's. Glumes 4 mm., floriglumes half as 



long. oligoclada. 



di,. Culm 30 cm., from a creeping base, branching, sheathed. Leaves distichous, 



short. Floriglume as long as empty glumes. disticJiophylla. 



c2. Panicle contracted. Spikelets small. 



d. Erect, culms 20 cm. Spikelets straw-colored. Glumes subequal, exceeding the 



flower; floriglume 3 -toothed. flavidula. 



d2. Creeping ; culm 9 cm., stoloniferous. Leaves flat. Floriglume truncate, nerve- 

 less, prostrata. 

 <T3. Panicle slightly contracted, spikelets small. Keel of glumes rough, acute-awned. 

 Culm sheathed half-way. Leaves plane, shortish. Rays spiculiferous from the 

 base. sanctacruzensis. 

 b$. Scabrous and strict. Panicle contracted, glabrous. Rays in umbellate verticils. 



umbellata. 



