﻿104 PLANTS FENDLERIAIWE. 



f424. Helenium autimnale, Linn. Bottom-land near the Mora River, Au- 

 gust (467) ; and between Council Grove and Fort Leavenworth, Sept. (468.) 

 s f425. Amauria? dissecta (sp. now) : lierbacea, puberula ; caule adscendente apice 

 corymbosi-polycephalo ; foliis alternis petiolatis biternatisectis segmentis cuneiformibus 

 vel sublincaribus saepius 2-3-fidis, summis parvis ; pedunculis glandulosis ; involucri 

 squamis oblongo-lanceolatis subtriseriatis, intimis subscariosis ; receptaculo convexo ; 

 ligulis circiter 16; styli ramis fl. disci cono brevissimo truncati-capitatis ; acheniis ad 

 angulos laevibus. — A few miles east of Mora River ; Aug. (537.) Also gathered in 

 Fremont's third expedition, probably towards the head-waters of the Arkansas. — Stem 

 12 or 15 inches high, apparently from a perennial root. Leaves about an inch in diam- 

 eter, cut into narrow divisions. Peduncles clothed both with viscous and capitate-glandu- 

 lar hairs. Involucre herbaceous, more or less viscous, a third of an inch in diameter. 

 Receptacle entirely destitute of chaff. Flowers all yellow: rays linear-oblong, 2- 

 3-toothed ; the tube very glandular. Disk-corollas with the slender tube extremely 

 glandular, the expanded 5-cleft limb slightly so. Branches of the style short, flattish- 

 semiterete, capitate with a very short and flattish obtuse cone. Achcnia cuneate-linear, 

 slender, compressed-quadrangular, smooth ; the ovary sprinkled with sparse and minute 

 hairs. Pappus none. — The specimen of Fendler has not matured fruit ; and the sta- 

 mens are abortive in all the disk-flowers. The specimen from Fremont's collection, com- 

 municated by Dr. Torrey, is very imperfect, but has ripe achenia. From the character 

 of the Californian genus Amauria, Bcnth. in Bot. Voy. Sulph. p. 31, this plant differs very 

 essentially in the styles, and in the convex receptacle. But I am unwilling to constitute 

 it a distinct genus upon the present imperfect materials.* 



* Galinsoga parviflora, Cav., was gathered by Dr. Gregg at Saltillo, and by Dr. Wislizenus at Cosiqui- 

 riachi, Chihuahua. The specimens from the latter locality have the pappus of the ray reduced to a few 

 setiform squamellse, and also in other respects agree with the Vargasia Caracasana, as described by De Can- 

 dolle ; but not with the figure in Deless. fyc. Sel. 4. t. 47, where the pappus of the ray is represented nearly 

 like that of the disk, and the latter as much shorter than the corolla instead of " palea? corolla triplo longi- 

 ores." Probably the Vargasia, DC, is not even specifically distinct from Galinsoga parviflora, as Mr. Ben- 

 tham has intimated. At Monterey, Dr. Edwards and Major Eaton gathered Tridax procumbens, Linn. ; 

 and Dr. Wislizenus's collection contains a single specimen of a second species, with red or purple rays, 

 viz. : — 



, Tridax bicolor (sp. nov.): annua, humilis, glanduloso-pubentissima ; caule erecto ; ramis apice modice 

 nudis monocephalis; foliis oblongis vel lanceolatis integerrimis (an semper) ; paleis receptaculi oblongis longe 

 acuminatis; ligulis rubris cuneati-oblongis breviter 3-lobis ; pappo purpurascenle e setis circiter 20 achenium 

 requantibus corolla disci atque tubo ligularum dimidio brevioribus. — At Llanos in the Sierra Madre, west of 

 Chihuahua, Dr. Wislixemts : flowering in November. — The specimen is only a span high, somewhat cine- 



