VI. PLANT.E AVRIGHTIAN.E. 107 



paiillo superantibus ; appendicibus styli fl. bermaph. attenuato-filiformibus ; acheniis 

 lineari-oblongis villoso-ciliatis, pilis crebris squamellis pappi a?quilongis ; arista 

 unica gracillima barbellato-hispidula corolla disci paiillo breviore. — In a canon of 

 the Rio Grande, with the preceding, Dr. Parrij. — Heads on a slender and naked 

 peduncle, as large as those of P. leptoglossa (4 or 5 lines long) ; the leaves more 

 rounded and reniform, scarcely incised, of the same hue both sides, nearly an inch 

 in diameter. Involucre shorter than the disk, viscid-puberulent like the leaves and 

 branches ; the scales lanceolate-linear. Ligules 2 or 3 lines long, yellow. Awn 

 of the pappus 2 lines or more in length. Mature achenia not seen. This species 

 ranks between P. leptoglossa and P. plumigera, most resembling the former. Its 

 heads and flowers are thrice the size of those of the latter. 



Perittle aglossa (sp. nov.) : glabella ; foliis sa?pius alternis rotundatis subcor- 

 datis incisis lobatisve dentatis ; involucri squamis angustissime linearibus ; ligulis 

 nullis ; appendicibus styli angustis subulatis ; acheniis lineari-oblongis marginibus 

 vix incrassatis villosissimo-ciliatis, pilis squamellas pappi adgequantibus ; seta unica 

 barbellata corbllam disci sequante. — In a canon of the Eio Grande, with the two 

 preceding. Dr. Parry. — Plant 6 to 12 inches high from a sufFrutescent base. 

 Leaves (in the specimen) only half an inch in diameter, minutely puberulent under 

 a lens with viscid or resinous granules. Heads corymbose, as large as those of the 

 foregoing species; the peduncles bearing two or three scattered setaceous bract- 

 lets. Scales of the involucre uniserial, remarkably narrow. Corolla 3 lines long. 

 Branches of the style not so slender as in Perityle Parryi and P. leptoglossa, 

 but much more so than in P. Californica and P. Acmella. Achenia fully a line 

 and a half long, blackish, glabrate on the sides ; the margins ciliate with a dense 

 and strong fringe of hairs, a few of which are also borne on the base of the 

 slender awn. The latter is about twice the length of the achenium. — This species, 

 which is remarkable for tl»e want of ray-flowers, certainly fixes the position 

 of the genus Pericome (p. 81) in the immediate neighborhood of Perityle, as I had 

 suspected. 



*^* The Cactace.?: of Mr. Wright's various collections will soon be published 

 by Dr. Engelmann, in a separate memoir. 



I have to correct a mistake respecting the gentleman to whose memory the genus 

 Peteria was dedicated (p. 51 of the former memoir), as, I am informed, he is still 

 living, although he has ceased to cultivate Botany. 



