PLANTJ3 NOV^ THURBERIAN^. 325 



Wrightii ; but the rather chartaceous leaves are more reticulated and roughish, the 

 corymb is generally thyrsiform, the involucre fevi^er-flowered and proportionally longer, 

 its scales are abruptly pointed, and the pappus is much stifFer. In the foliage, in- 

 florescence, &c., it resembles P. (Acourtia, DC.) microcephala, which must have more 

 flowers in the head, and narrower involucral scales. P. Humboldtii (the Proustia 

 Mexicana of Don and the original Dumerilia of Lessing), the only five-flowered species 

 hitherto described, is said to be a shrubby plant, with leaves only an inch or two in 

 length. — The present species plainly shows that Dumerilia has no claim to the rank 

 of a genus. 



Stephanomeria Thtjrberi (sp. nov.) : caule virgato siniplici puberulo profunde stri- 

 ato bipedali superne longe aphyllo ad apicem in ramos floriferos paucos paniculatos di- 

 viso ; foliis runcinatis, radicalibus oblongo-spathulatis lobis creberrimis, caulinis infimis 

 sublinearibus, superioribus minutis subulatis ; capitulis (pro genere magnis) sparsis ; 

 involucre circiter 20-floro. — On the Sierra de los Animos, Sonora; June, 1851.* — 

 " Flowers pink, fragrant." — This is the largest-flowered species of the genus known ; 

 the involucre and disc being almost half an inch in length, and the flowers are much 

 more numerous in the head than in any other. The stem is unbranched in the speci- 

 men, except at the summit, and the leaves occur only at or near the base ; they are two 

 inches or more in length, and the radical ones three quarters of an inch wide, a little 

 pubescent, or soon glabrate. The root is probably biennial. Pappus white, very plu- 

 mose. Achenia not seen ; the flowers being all young. I have not seen Nuttall's S. 

 elata ; but that species is stated to be only ten-flowered, and is probably identical with 

 Bentham's S. virgata. 



Jacquinia pungens (sp. nov.) : ramulis junioribus puberulis ; foliis confertis subver- 

 ticillatis lineari-lanceolatis valde rigidis aculeato-acuminatis aveniis margine subrevolu- 

 tis subtus punctatis ; floribus ad apicem ramorum corymbosis aurantiacis pedicello 

 paullo brevioribus ; fructu globose. — Hills between Eayon and Ures, Sonora ; October 

 (with unripe fruit and some flowers). — A shrub from 8 to 12 feet high, with the very 

 rigid and pungent, pale leaves (about an inch long and two lines wide) much crowded 

 on the short branchlets, subsessile, either alternate, or imperfectly verticillate, or oppo- 

 site, veinless, the midrib and margins thickened underneath. Corymb several-flowered, 



* The same species occurs in a collection made last year in the neighborhood of the Mimbres, by Dr. 

 Henry, U. S. A., which has just been received. 



