﻿PLANTiE FENDLERIAN*:. 109 



half an inch long, early glabrate above ; but still floccose or white-woolly underneath. 

 Involucre 3 lines long. Rajs 4 or 5 lines long.* 



* Senecio Tampicanus, DC, is in Dr. Gregg's collection, from a " low valley of the Rio del Parral near 

 Santa Rosalia." It bears the marks of having been floccose at an early stage. — Nearly allied to this is 

 S Senecio mcltilobatus (Torr. <$- Gray, Fl. ined.): annuus seu biennis, citissime glaber, pedalis, multi- 

 caulis; caulibus simplicibus apice corymbiferis ; foliis subcarnosis, primariis spathulatis secpe indivisis, sequen- 

 tibus omnibus pinnato-9-21-partitis, inferioribus longe petiolatis, summis sessilibus basi vix aut ne vix 

 auriculatis, segmentis cuneato-oblongis apice inciso-dentatis vel 2-3-lobatis; corymbo denso polycephalo ; 

 involucro fere ecalyculato 12- 14-phyllo ; ligulis 5-6 oblongis ; fl. disci 20-30; acheniis strigoso-puberu- 

 lentis. — Abundant on the Uintah River, in the interior of California, Fremont (second expedition). — Var. 

 $. foliis inferioribus magis interrupte pinnatisectis, pinnis majoribus lobatis. Monterey to San Gabriel, Coulter. 

 — Heads as large as those of S. aureus. 



Another unpublished Californian species, which was gathered by Fremont in his third expedition, is 

 ■** S. eurycephalus (Torr. 6} Gray, Fl. ined.): perennis? glabratus; caule pedali crasso simplici ; foliis 

 sublyrato-pinnatipartitis inferioribus longe petiolatis summis sessilibus; segmentis 7-11 oblongis cuneatisve 

 apice incisis grosse et argute dentatis, infimis parvis, superioribus sensim majoribus confluentibus ; capitulis 

 magnis 7- 9 in corymbum laxum digestis longe pedunculatis ; involucro late campanulato parce calyculato 

 circiter 24-phyllo multifloro ; ligulis 10-12 elongalis; acheniis glaberrimis. — California, Fremont; also 

 Hartweg. — Radical leaves somewhat bipinnatifid, the lowest cauline on petioles of from two to four inches 

 long and exceeding the lyrate lamina, the upper lobes all confluent ; the succeeding cauline leaves less lyrate, 

 and with more numerous segments, which are about half an inch long, cut into coarse and pointed teeth. 

 Involucre half an inch in diameter. Rays over half an inch long. Pappus very copious. 



At Llanos, Dr. Wislizenus gathered a perfectly glabrate form of S. Hartwegi, Benth. The achenia are 

 entirely glabrous, and the stem herbaceous. 



On account of its opposite leaves, its involucre of only four or five broad scales, and the scanty pappus, 

 the following plant of Dr. Gregg's collection appears to constitute a distinct genus, viz. : — t 



HAPLOESTHES, Nov. Gen. 



Capitulum globosum, multiflorum, heterogamum ; fl. radii 4-5 ligulatis, fcemineis; disci tubulosis herma- 

 phroditis. Involucrum uniseriale, e squamis 5 late ovalibus plurinerviis constans, ecalyculatum. Receptacu- 

 lum convexum nudum. Ligulce late ovales. Corolloe fl. disci 5-dentata3, sub 10-nervia?, nervis accessoriis ad 

 medium loborum direclis. Antherse, styli, et achenia (immatura) omnino Senecionis. Pappus uniserialis, 

 e setis capillaribus tenuissimis vix 20, corolla disci paulo brevioribus. — Herba glaberrima, ramosa, gracilis ; 

 foliis oppositis filiformibus integerrimis; capitulis parvulis laxe corymbosis ; floribus flavis. 

 S H. Greggii. — Valley near Ciefiega Grande, Coahuila, Dr. Gregg; May. — Plant 2 feet high, erect, 

 with a terete stem and branches, leafy. Root unknown. Leaves all opposite, one or two inches long. 

 Corymb naked. Peduncles slender. Involucre herbaceous, slightly yellowish, two or three lines in diameter. 

 Rays broadly oval, scarcely two lines long, 7-nerved. The accessory or median nerves of the disk-corolla 

 are as strong as the others, but are nearly wanting in one or two of the lobes. Immature achenia terete, 

 glabrous. Pappus of 15 or 20 minutely scabrous capillary bristles. 



