112 PLANTS WEIGHTIAN^. T. 



352. XiMENESiA ENCELioiDES, Cav. B. CANA, DC. Pvodr. 5. p. 627; Grai/, PI. 

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

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



■\ Verbesina Virginica, Linn. var. /3. Torr. 8f Gray, Fl. 2. p. 359. V. poly- 

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

 another form of V. Virginica. 



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

 baceis gracilibus pedunculo nudo monocephalo terminatis ; foliis ovalibus ovatisve 

 obtusis hand venosis subintegerrimis petiolatis ; involucro subtriseriali, squamis 

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

 angulis acutissimis dense ciliolatis ; paleolis pappi inter aristas pi. m. coroniformi- 

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

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

 534.) — A shrubby or sufFruticose, branching plant, two or three feet high; the 

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

 the petioles two or three lines long. Heads three or four lines long. Exterior 

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

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

 except the ciliolate very acute angles ; those of the ray triquetrous and 1 - 3-awned, 

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

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

 more 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- 

 chseta strigosa, DC. 



354. Z. Texana: strigoso-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 

 elongatis nudis monocephalis ; involucro biseriali, squamis exterioribus lanceolatis 

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

 alibus glabris, disci appresse hirsutis ; aristis basi cum coronula paleacea calyci- 

 formi concretis. — Lipochseta (Catomenia) Texana, Torr. Sf Gray, Fl. 2. p. 357; 

 Gray, 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 are 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 species, this is the 

 •one to which the phrase " lignla; minimse " is most applicable. These are ovate, obtuse, 2-3-denticulate 

 at the apex. — Allied to this species is 



Sanvitalia angustifolia (Engelm. in coll. Gregg.) : caulibus diffusis ; foliis lanceolatis strigoso- 

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

 oribus fere exalatis subcalvis, interioribus anguste alatis biaristellatis. — Highlands near Buena Vista, 

 Mexico, Gregg (No. 274). 



