112 



PLANT^ WRIGHTIAJJ^ 



y. 



352. Xdie^esia 



ENCELioiDES, Cav, S. CANA, DC. Prodr. 5. p. 627; Grai/, Pl 



Fendl p. 87. On tlie Rio Grande, Texas ; and from the Limpia to the Rio Grande 

 New Mexico. There is a very dwarf state in the collection of 1851. 



t Veiibesina Virginica, Linn. var. ^. Torr. ^ Grai/, Fl. 2. p. 359. V. poly- 

 cephala, DC. ! Prodr. 5. p. 616. Western Texas.— V. microptera, DC. is, I believe 



anothcr form of V. Virginica. 



353. Zexmenia brevifolia (sp.nov.): fruticosa, scabro-hispidula ; ramis subher 



baceis gracilibus pedunculo nudo monocephalo terminatis; 

 obtusis haud venosis subintegerrimis petiolatis ; involucro subtriseriali, squamis 

 extcrioribus apice foliaceo ovato patulo instructis ; acheniis (immaturis) exalatis 



5 dcnse ciliolatis ; paleoHs pappi inter aristas pl. m. coroniformi- 

 concretis. — Rocky banks of a mountain stream between the Limpia and the Rio 

 Grande, New Mexico, Sept. (Hills near Messilas, Northern Mexico, Greg^, No. 

 534.) _A shrubbyor suffruticose, branching plant, two or three feet high ; tlie 

 branches slender. Leavcs opposite, from half to three quarters of an inch long ; 



foliis ovalib 



o 



three lines lonsr. Heads three or four lines lonsr. Exte 



scales of the involucre more or less foliaceous and lax ; the others appressed, inap- 

 pendiculate, oblong, the innermost lanceolate and acute, a little shorter than the 

 disk. Rays 5 to 8, small. Palese of the receptacle lanceolate, attenuate-acuminate, 

 conduplicate, a little shorter than the disk-fiowers. Achenia (immature) glabrous 



ery 



of the rav triauetrous and 1 - 3-awned 



h 



of the disk compressed and unequally 2-awned. Between the awns are several 



lanceolate or oblong and pectinate-incised squamellae or palese, which are irregularly 



morc or less united into a crown, or sometimes almost distinct. The ripe achenia 



are probably more or less winged. — A manifest congener of the next, and of Lipo- 

 cha?ta strigosa, DC. 



354 Z. Texana: stiigoso-hispida ; caulibus e basi sufFrutescente erectis gracili- 

 bus ; foliis rhombeo-lanceolatis seu ovato-lanceolatis basi acuta sessilibus parce 

 dentatis nunc subhastato-lobatis, ramealibus lanceolatis integriusculis ; pedunculis 



gatis nudis monocephalis ; involucro b 



i 



exterioribus 



subfoliaceis interiores oblongas sequantibus ; acheniis pl. m. obcordato-alatis, radi- 



alibus glab 



hirsutis; aristis basi cum coronula paleacea caly 



formi concretis. — Lipochaeta (Catomenia) Texana, Torr. §• Gra^, Fl. 2. p. 357; 

 Graij, Pl. Lindh. 2. p. 229. Prairies near New Braunfels, Texas. — The achenia 

 vary greatly as to the wing, even in the same capitulum, just as is the case in species 

 of Verbesina and Actinomeris. Those of the ray are obcompressed-triangular, 



Gregg (No. 163). Many of the disk-achenia arc more or less two-toothed at the apex, or aristulate, as 

 indeed they are, though obscurely, in De Candolle^s plant from Berlandier. Of all the specics, this is the 

 one to which the phrase " ligufe minima^ » is most applicable. These are ovate, obtuse, 2- 3-denticulate 

 at the apex. — AUied to this species is 



caullbus diffusis : foliis lanceolatis strigoso- 



ANGUSTIFOLIA 



hispidis; ligulis parvis aristis brevioribus acutiusculis setulis 3-5barbato-apiculatis; acheniis disci exteri- 

 oribus fere exalatis subcalvis, intcrioribus anguste alatis biaristellatis. — Hiirhlands near Buena Vista, 

 Mexico, Gregg (No. 274). 



f 



