Allgemeine und specielle Morphologie und Systematik der Phanerogamen. 589 
fiowered. 5—1 in. long, erect or slightly spreading on short hairy pedicels; spikelets 
(including setae) 3—4 lines long; outer glumes unequal, the upper and larger one about 
2 lines long, both smooth, unequally 2-toothed and short awned: flowering-glume, exclusive 
of awns, about I line long, smooth or sparsely pilose, especielly near the margins above; 
pedicel of the sterile floret smooth, bearing three awns, which equal those of the flowe- 
ring-glume. 
B. Burkii n. sp. — Culmes slender, tufted, 4—6 in. high, erect or geniculate below, 
smooth or finely glandular pubescent; leaves divergent, short, the upper. 5 in. or less long, 
narrow and involute, smooth or with the sheaths, glandular pubescent, often with a few 
scattered longer hairs; spikes 3—5, about. 5 in. long, pectinately many-flowered, erect or 
ascending; spikelets, including setae, a little over 2 lines long; outer glumes ovate, smooth, 
nearly equal, the upper about a line in length, both usually very short awned just below 
the unequally bifid tip; flowering-glume, exclusive of the three continuous and equal awus, 
less than a line long, pilose with stiff hairs on the back and margins below; pedicel of 
rudiment. 5 line long, smooth, bearing three equal and minutely scabrous awns 2—5 lines 
long, which are more or less enlarged and flattened near the base. — Texas. 
B. Havardi, Vasey, in lit. — Culnes 10—15 in. high; lower leaves numerous, 
flat, rigid, 3—6 in, long, 1—2 lines wide, more or less pubescent on the margins below 
and on the sheaths, upper leaves short (1—2 in.); ligule a ciliate line; panicle 2—3 in. 
long, erect, composed of 5 or 6 approximate shert, spikes of about 10, crowded, erect, 
1-flowered spikelets; outer glumes lanceolate, the lower nearly as long as the flower, the 
upper, half as long; fiowering-glume 2.5 lines long, broad-oval, 3 lobed, the lobes extending 
nearly half way down, the lateral ones becoming somewhat recurved; paled as long as its 
glume, narrow, with two stout recurved teeth at the apex; sterile flower longer than the 
perfect one, the pedicel 1 line long, the three awns each 4 lines, the middle one membra- 
neous-margined nearly to the apex. The crowded rhachis and outer glumes, as also the 
back of the flowering-glume and palet, clothed with long villous hairs. — Texas. 
B. pusilla Vasey, ined. — Perennial (?), 2t0 3 inches high; leaves smooth, very narrow 
and involute, the upper an inch long; spikes solitary, pectinately 10—15 flowered, about. 5 
inch in length; rhachis smovth; spikelets (including setae) about 2 lines long; outer glumes 
smooth, the upper broadly lanceolate, 1.5 line long; twice the length of the unequally 
1-nerved lower one; flowering-glume very hairy at the base and on the lateral and middle 
nuves below, the long middle lobe 2-cleft, the stout central seta a line long, exceeding the 
two lateral ones; palet very broad, and longer than its glume; pedicel of sterile floret. 
5 line long, with a tuft of hairs at the top, and bearing two or three rudimentary, hooded 
glumes or scales and three equal awns exceeding a line in length. New-Mexico. 
Trisetum Halli n. sp. — Culmes slender, 6—18 in. high, smooth; leaves flat, a 
line or less wide; minutaly scabrous, involute near the tip; panicle contracted, 2-—4 in. 
long, the erect and densely flowered branches an inch or less long; spikelet about 2.5 lines 
long, 2—3-flowered, the nearly smooth rhachis prolonged above the upper floret, and often 
bearing a slender hair like own; outer glumes about 1.5 line long, equal in length, obtuse, 
the lower narrowly oblong, 3-nerved, the upper much broader and 5-nerved, nerves prominent, 
aculeate-scabrous, the lateral ones terminating below the scarious margin, which is finely 
ciliate on the edge; the first flowering-glume 1.5--2 lines long, tuberculate-roughened on 
the back and scabrous near the tip, terminating in two acute teeth and bearing a scabrous, 
straight awn a line long, teeth of the second and third florets prolonged into slender setae 
less than a line in length, awn longer, twiceted below and bent near the middle; palea about 
two-thirds as long as its glume; grain smooth, about 1 line long. Texas.“ 
321. Geo. Vasey (397) giebt die Diagnosen von Panicum Chapmani und P. Hall. 
Jenes ist identisch mit P. tenuiculmum Chapman, dieses mit P. giganteum Scheele. 
322. Geo. Vasey (398) beschreibt einen Bastard zwischen Trisetum palustre L. > 
Eatonia Pennsylvanica Gr. und bildet die entsprechenden Blüthen ab. 
323. Geo. Vasey (399) giebt eine englische Beschreibung der von Engelmann be- 
stimmten neuen Species: Aristida basiramea. | 
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