VI. 



PLANT^i: WRIGHTIAN^. 



91 



dried speclmens in the collection.) — Plant a foot or two in height 



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

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

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

 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-flo^iTred, 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- 



their two minute retrosely 



few 



nia 2 lines long, blunt, not broader than the otl 



barbed awns early deciduous : next to these are a 



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



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



w 



length, 



Heterospekmum TAGETiNUM, Gi^ai/y Fh Fendl p. 81, ^ FL WrigJit, p. 110; var. 

 aclieniis plerumque omnibus exaristatis. — Mountain-sides at tlie copper mines ; 



Oct (1235 bis-) — The lobes of the rather rigid 



ly 



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

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

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

 the segments of the Icaves often lobed, and tlie central achcnia awned. The want 

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

 manently, from H. pinnatum. 



GuARDioLA. PLATYPHYLLA (sp. nov.) : glaucesccns ; foliis brevissime petiolatis 



tundis dI. m. eordatis 



dentatis triplinerviis ; involucro 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.) — Thi^ is an interesting addition to this well-markcd genus, of 

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

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

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

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

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

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

 2-2" or more in breadth ; the uppcr and ranieal successively smaller, but otherwise 

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

 pctioles, and the base of tlie leaves inclined to be cunoate. Inflorescence, involucre, 

 &c. nearly as in G. Tulocarpus. Involucre about 5 lines long. Eay-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. Anthcrs 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, Graij, Pl Fendl p. 87, ^ Pl Wright. p. 111. Stony hills 

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



