86 PLANTEH FENDLERIAN2. 
prairies, said to have been made by the buffaloes in wallowing. —The rays are brown 
only at the base. 
+398. C. invotucrata, Nutt. in Trans. Am. Phil. Soc. (n. ser.) 7. p. 360. Hollows 
in the prairies near 110 Creek; Sept. (444). — The achenia are obovate, repand-trun- 
cate at the apex, scarcely 2-toothed, entirely awnless; the margins hispid. 
* - 399. Cosmos sipinnatus, Cav. Ic. 1. p. 9, t. 14. Woodland, ten miles west of 
Las Vegas; Aug. (447.)— Rays smaller than in Mexican specimens ; the achenia only 
two-awned. (No. 448 is an autumnal specimen of the same, in fruit; from Santa Fé.) 
pte. : 400. Cosmipium eracite, Torr. & Gray, Fl. 2. p. 350. Santa Fé, at the foot of 
< ileasn we ete oth . 5 . r 
bay irrigating ditches; and on the Rio del Norte; May to Sept. (445.) (Also gathered by 
‘ / Fremont on the Upper Platte and Arkansas, and by Wislizenus on the Arkansas, and 
again at Albuquerque.) — The specimens are all rayless, like that of Dr. James. The 
corolla is yellow, but turas brownish in fading. The mature achenia are narrowly linear, 
straight or nearly so, 4 lines long, more or less tuberculate ; their base cohering with that 
of the chaff, with which they fall away ; the abrupt apex bearing two short and diverging 
retrorsely barbed persistent awns. — There is a third species, with simple leaves, in Dr. 
Grege’s collection.* 
401. Binens renuisecta (sp. nov.): annua, glabriuscula, caule ramoso tereti ad- 
scendente ; ramis striato-angulatis apice nudo 1 —3-cephalis ; foliis (oppositis alternisve) 
bipinnati partitis vel biternatisectis, segmentis linearibus integerrimis seu 2—3-lobatis 
rachi paulo latioribus ; squamis involucri hirsuti linearibus ; ligulis 5 —-8 inconspicuis dis- 
cum vix equantibus; acheniis attenuato-linearibus glabris subtetragonis striatis breviter 
2-aristatis. — Margins of Poni Creek (between Bent’s Fort and Santa Fé); Oct. (449.) 
— Plant one or two feet high, with a very smooth stem. Segments of the leaves seldom 
over a line in width, and, except the lowest, little wider than their rachis. Heads 
rather larger than those of B. bipinnata, and with a greater number of disk-flowers. The 
naked peduncles in the wild specimens are 5 or 6 inches long, bearing a single head; in 
nating the stem or the few short branches, on thick peduncles of only half an inch in length. Involucre an 
inch in diameter. Sterile ray-achenia nearly smooth, with a short pappus: fertile achenia 3 lines long; the 
stout awns about the same length, three or four times the length of the rigid lacerate-denticulate squamelle. 
Although different in aspect from the described species, it agrees in floral characters with Tithonia. | 
* CosMIDIUM sIMPLIctFottuM (sp. nov.): caulibus e radice perenni simplicibus 1 -3-cephalis ; foliis rigi- 
diusculis filiformi-linearibus integerrimis ; squamis involucri exterioris ovatis parvis, interioris ad medium con- 
hg | <_natis ligulis obovato-cuneatis apice trilobis multo brevioribus; acheniis valde immaturis dentibus 2 squamecfor- 
mibus retrorsum hispidis coronatis (maturis ignotis). — High and dry land, battle-field near Buena Vista, 
Coahuila, Dr. Gregg ; May. — Leaves two inches long; the radical ones slightly dilated upwards. Ligules 
a $x half an inch long. 
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