NEW OR NOTEWORTHY SPECIES. 213 
rose-purple flowers short-peduncled: subulate calyx-teeth 
rather longer than the short tube: loments large, usually of 
2 or 3 joints, these conspicuously margined and with sharply 
raised and rather closely parallel transverse rugosities which 
are either distinct throughout or which run together into a 
few reticulations over the seed. 
Common in clayey soil about the mouth of the Cafion of 
the Arkansas, in southern Colorado. Hitherto referred, 
though very carelessly, to H. Mackenzii ; but very distinct 
from that and all other species of this country by its sub- 
succulent herbage and veinless leaflets; and the conspicuous 
close transverse lineation of the loment is an important 
technical character. 
Hepysarum LEUCANTHUM. H. Mackenzii, var. leucanthum, 
Greene, Pitt. ii. 294. Stems tufted, scarcely a foot high: ob- > 
long leaflets rather remote, silvery-canescent beneath, glabrate 
above: peduncles elongated and subscapiform, surpassing 
the leaves and stem: racemes very short and dense, not 
longer than broad: flowers large, white: subulate-lanceolate 
segments of the calyx decidedly longer than the tube, the 
whole calyx silvery-canescent: fruit unknown. 
Since the publication of this high northern plant asa 
variety of H. Mackenzii I have been assured by my friend 
Mr. James M. Macoun, who has seen it growing, that it is, 
as its peculiar habit indicates, a thoroughly distinct species. 
TRIFOLIUM cALOoPHYLLUM. Annual, slender, branched 
from the base and decumbent or depressed, the branches - 
about 1} feet long, the whole herbage flaccid, deep green 
and glabrous: leaves long-petioled, the leaflets extremely 
variable; the very lowest barely 2 lines long, cuneate-ob- 
cordate, spinulose-denticulate ; those of the middle part of 
the stem an inch long or less, from obovate to rhombic-lanceo- 
late and lanceolate, usually sinuately lobed and the lobes 
spinulose-dentate, sometimes not lobed but doubly dentate, 
the uppermost elliptic-lanceolate to linear-lanceolate, all 
