VI. PLANTS WRIGHTIAN^. 91 



are no dried specimens in the collection.) — Plant a foot or two in height, panicn- 

 lately or corymbosely much branched, leafy. Leaves one to two inches long, in- 

 cluding the short and naked petiole, rarely pinnatcly 5-parted ; the upper usually 

 3-parted, with the segments either entire or 2 - 3-cleft ; the lower ones biternately 

 parted : segments 3 to 12 lines long, and half a line wide. Heads sparsely corym- 

 bose-paniculate, 3 lines long, one or two lines wide, rather few-flowered, on pedun- 

 cles of an inch or less in length. Involucre entirely glabrous ; the scales broadly 

 linear, obtuse ; the exterior shorter ; the inner yellow or yellowish. Exterior ache- 

 nia 2 lines long, blunt, not broader than the others, their two minute retrosely 

 barbed awns early deciduous : next to these are a few achenia with awns like the 

 innermost, which are 4 or 5 lines long, projecting beyond the disk at maturity, and 

 crowned with two, or sometimes three, retrorsely barbed persistent awns of a line in 

 length. 



Heterospermum tagetinum, Graif, PI. Fendl. p. 87, %■ PI. Wrif/ht. p. 110 ; var. 

 acheniis plerumque omnibus exaristatis. — Mountain-sides at the copper mines ; 

 Oct. (1235 bis.) — The lobes of the rather rigid leaves are simple and obscurely 

 and irregularly dotted, as in other plants of this group. Both in the indigenous 

 specimens, and in those raised from their seeds, even the central achenia rarely 

 show even the rudiments of awns. — A few specimens from Ojo de Gavilan have 

 the segments of the leaves often lobed, and the central achenia awned. The w"ant 

 of awns on the short fertile achenia alone distinguishes them, and perhaps not per- 

 manently, from H. pinnatum. 



GuARDioLA PLATYPHYLLA (sp. uov.) ! glaucesceus ; foUis brevissime petiolatis 

 ovato-rotundis pi. m. cordatis dentatis triplinerviis ; involucre cylindrico, squamis 

 oblongis obtusis ; ligulis 1 - 3, tubo glaberrimo, fl. disci 5 - 7 ; achenio pilosulo. — 

 Hill-sides, along exsiccated streams, between Barbocomori and Santa Cruz, Sonora ; 

 Sept. (1236 bis.) — This is an interesting addition to this well-marked genus, of 

 which three species were characterized in PL Wright, p. 111. I have it also in 

 cultivation, from seeds communicated by Mr. Wriglit. The terete stems are about 

 3 feet high, with many corymbose branches. The leaves are pale and more or less 

 glaucous, thickish in texture, rounded, mostly obtuse, mucronate, subcordate or 

 truncate-cordate at the base, repandly and sometimes strongly dentate with cal- 

 lous mucronate teeth. The larger cauline ones are about 3 inches in length and 

 2i or more in breadth ; the upper and rameal successively smaller, but otherwise 

 similar ; the petioles only 1 to 3 lines long. The other species have much longer 

 petioles, and the base of the leaves inclined to be cuneate. Inflorescence, involucre, 

 &c. nearly as in G, Tulocarpus. Involucre about 5 lines long. Ray-flowers not 

 longer than those of the disk, the slender tube shorter : ligule 3 lines long, obscurely 

 2 - 3-toothed, white, as are the disk-corollas and styles. Anthers green. Fertile 

 achenia nearly 3 lines long, obscurely striate, furnished at the base with a sort 

 of tuberosity or cushion-like enlargement on the back, which cannot be called an 

 adherent scale : in the dried state it shrinks away. 



Sanvitalia Aberti, Gray, PI. Fendl. p. 87, 8r PI. Wright, p. 111.' Stony hills 

 and valleys, at the copper mines, New Mexico ; Aug. (1237 bis.) 



