﻿PLANTiE FENDLERIAN.E. 93 



S 409. Riddellia tagetina, Nutt. ! in Trans. Amer. Phil. Soc. (n. ser.) 7. p. 371 : 

 Torr. $• Gray, Fl. 2. p. 362, fy Suppl. Compos, ined. ; Torr. in Emory's Report, t. 5. 

 Valley of Santa Fe Creek, at the foot of hills, near irrigating ditches ; June, July : also 

 between San Miguel and Santa Fe, in woodland; Oct. (461.) — These are exceed- 

 ingly fine specimens of a rare and interesting plant, which, from its profuse corymbose 

 heads with their large, bright-yellow, papery-persistent rays, would be very ornamental in 

 cultivation. Col. Emory likewise gathered specimens in New Mexico ; and Dr. Wis- 



claudentem apice uni- vel in radio bi-aristatum arete coalitis, aristis barbellatis. — On high mountains around 

 Cosiquiriachi, in the Sierra Mad re west of Chihuahua, October, Dr. Wislizenus. — The stems of this little 

 plant are only an inch and a half high ; while the peduncles are nearly the same length. The purplish invo- 

 lucres are half an inch long; the filiform tube of the (yellow) ligules nearly as long. Receptacle convex, 

 alveolate. Tube of the pappus unequally 3-4-toothed at the apex, and produced into a stout rough-barbellate 

 awn much longer than the disk-corolla, or in the ray often with two such awns. 



^ CHRYSACTINIA, Nov. Gen. inter Tagetearum et Porophyllearum ? 



/ Capitulum multiflorum, heterogamum ; fl. radii 9 - 12, ligulatis, fcemineis, disci tubulosis hermaphroditis. 

 Involucrum uniseriale disco brevius ; squamis 9- 12, fequalibus, distinctis, oblongo-linearibus, dorso carinatis, 

 supra medium uniglandulosis. Receptaculum parvum, hemisphmricum, corneo-alveolatum. Ligulse elongata?, 

 oblongae. Corollas disci tubulosa.' 5-dentata?, dentibus ad margines incrassato-puberulis. Styli fl. hermaph. 

 rami elongati, anguste Iineares, planiusculi, cono brevi obtuso hispidulo terminati, et dorso infra apicem minu- 

 tim hirtelli. Achenia elongata, linearia, erostria, multistriata, hispidula, involucro fructifero laxo cequilonga, 

 callo basilari manifesto. Pappus pilosus simplex ; setis fere uniserialibus, denticulato-scabris, achenio longiori- 

 bus. — Fruticulus Mexicanus, ramosissimus, glaber ; ramis strictis conferte foliosis ; ramulis floridis fastigiatis in 

 pedunculis nudis parce setaceo-bracteatis monocephalis desinentibus ; foliis alternis imisve saepe oppositis, 

 lineari-subulatis, mucrone apiculatis, crassis, supra ad costam sulcatis, utrinque serie glandularum grossarum 

 rotundarum notatis; floribus aureis, ligulis disco duplo longioribus conspicuis. (Chrysactinium § Andromachiar, 

 Kunth = Liabium, Adans.) 



S C. Mesicana. — Dry valley west of Saltillo, April ; and on high grounds near Buena Vista, May, Dr. 

 Gregg. Also at " Ojo del Agua," near the city of Mexico? Dr. Hahlead (in herb. Torr.). Shrub one or 

 two feet high, Heath-like ; the rigid steins roughened with the scars of fallen leaves. The leaves are light- 

 green, crowded, apparently persistent for two years, from one fourth to two thirds of an inch in length, flat or 

 more or less involute, very conspicuously pustulate, especially underneath, with a row of large and impressed 

 brownish glands. Peduncles one or two inches long. Heads an inch broad, including the elongated spread- 

 ing rays. Involucre only two or three lines long ; the single gland on each scale oval or oblong. Pappus 

 longer than the achenium, somewhat tawny or livid. — This plant apparently is by no means uncommon ; 

 but I find it nowhere described. The characters of the style, in which the stigmatic lines extend through the 

 whole length of the flattish branches quite into the short flattened-conical tip, as well as the principally alter- 

 nate leaves, exclude the genus from the Eupectidece, as do the glands of the leaves from the division Liabece. 

 It must therefore be referred to Tagetineae, where it combines the characters of the two divisions, having the 

 rays and the style of the Tagetese, with nearly the pappus, involucre, and foliage of Porophyllum. The 

 name is given in allusion to the (golden-yellow) rays, which distinguish the plant from Porophyllum. 



