100 PLANTS WRIGHTIANiE. T. 



rio-idis, liirtellis, corolla dimidio brevioribus, majoribus achenio quadrangulari- 

 compresso asquilongis. 



300. Laphamia rupestris (sp. nov.) : subviscoso-pubescens, nana ; caulibus dif- 

 fusis ramosis usque ad apicem foliosis ; foliis ssepissime oppositis rotundatis, nunc 

 reniformi-subcordatis grosse dentatis incisisve longe petiolatis ; capitulis subcorym- 

 bosis breviter pedunculatis folia floralia subeequantibus. (Tab. IX.) — Crevices 

 of rocks, on mountains, in the Pass of the Lirapia ; Aug. Also in the collection of 

 1851. — Stems slender, 3 to 5 inches long, very numerous from a branching woody 

 caudex, as thick as a man's thumb. Leaves not rarely alternate, especially the low- 

 er ones, rather thin, pubescent when young, sprinkled with some very minute resin- 

 ous particles (as in Eupatorium), veiny, variable in shape and in the degree of 

 toothing, sometimes deeply laciniate-incised, sometimes barely crenate-toothed, from 

 half an inch to an inch in breadth: petioles 3 to 5 lines long. Heads cylindra- 

 ceous, 3 lines long, on peduncles of nearly the same length. Scales of the involu- 

 cre oblong-lanceolate, ciliate. Branches of the style narrowly subulate. Achenia 

 narrowly oblong, hirsute, compressed, but more or less quadrangular. Pappus of 

 about 20 rather rigid, but capillary, unequal, barbellate-hispid bristles. 



^ 2. Laphamia vera. Involucrum carapanulatum, 10 - 15-phyllum, 18- 30-florum, 

 disco paullo brevius. Ligulte 4-6, in unica specie nuUse. Corollee disci fauce 

 ampliata cylindracea tubo gracili valde glanduloso vix longiore. Achenia com- 

 pressa, binervia, exteriora nunc trinervia. Pappus unisetosus aut nuUus. 

 * Capitula parvula corymhosa : pappus nullus. 



301. L. halimipolia (sp. nov.) : glabella, nana ; caulibus rigidis usque ad apicem 

 foliosis ; foliis plerumque alternis ovatis basi cuneatis vel rhomboideis grosse et ir- 

 regulariter dentatis nitidulis resinoso-punctulatis ; capitulis confertim corymbosis ; 

 ligulis late ovalibus. (Tab. IX.) — Crevices of rocks, on the summit of hills, 

 near the San Pedro River; July. Also (much better specimens) in the collection of 

 1851. — Caudex woody, nearly an inch thick, branching, bearing numerous some- 

 what upright and slender stems, from 3 to 6 inches high. Leaves rather firm in 

 texture, an inch or less in length, 5 to 8 lines wide, three-nerved from the base, 

 veiny, beset with from 2 to 4 usually strong salient teeth on each side : petiole 

 3 lines long. Heads numerous, in the specimens of the later collection very nu- 

 merous, in a naked and compound fastigiate corymb, scarcely more than 2 lines 

 long, 18 - 20-flowered. Scales of the involucre about 10, linear-lanceolate, glabrous, 

 villous-ciliate at the tip. Ligule short and broad, 3-toothed at the apex. Branches 

 of the style in the disk-flowers setaceous-subulate. Achenia narrow, margined 

 with two strong nerves, which are minutely hispid, the sides nearly glabrous. 



X L. angustifolia (sp. nov.) : glabella, nana ; caulibus simplicibus confertis e 

 caudice crassissimo ; foliis oppositis vel alternis lanceolatis resinoso-punctatis 

 utrinque grosse 1 - 2-dentatis ; capitulis laxe corymbosis ; ligulis nuUis. — Between 

 Texas and El Paso ; coll. of 1851 ; the locality not jet given. — Nearly related to 

 L. halimifolia, and with a similar very thick and woody caudex, which sends up a 

 close tuft of stems, in these specimens all simple and barely three inches high, fasti- 

 giate ; the leaves less veiny, much narrower (one or two lines wide), and more com- 



