VI.

PLANT.E WRIGHTIAN.E.

91

are no dried specimens in the collection.) — Plant a foot or two in height, panic-
lately or corymbosely much branched, leafy. Leaves one to two inches 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 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. Involuere entirely glabrons; 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, Gray, *Pl. Fendl.* p. 87, &c. *Pl. Wright.* 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 want of awns on the short fertile achenia alone distinguishes them, and perhaps not permanently, from H. pinnatum.

GUARDIOLA PLATYPHYLLA (sp. nov.) : glaucescens ; foliis brevissime petiolatis ovato-rotundis pl. m. cordatis 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.) — 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. Wright. The terete stems are about 3 feet high, with many corymbose branches. The leaves are pale and more or less glaucons, 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 2½ 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. Involuere 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, Pl. Fendl. p. 87, &c. Pl. Wright. p. 111.* Stony hills and valleys, at the copper mines, New Mexico; Aug. (1237 bis.)