SEGREGATES OF RHUS. 143 
While its species there are all much reduced in size, they present 
a goodly array of comparatively ample foliage, on twigs and 
branches always lithe and flexible ; and the local deviations there 
from its trifoliolate norm are not at all in the direction of the 
pinnate, but just the opposite; for in the very centers of aridity 
the Schmaltzias in several species have simple leaves; and they 
are also leaves of fair size, making not the least approach to the 
leaflets of the pinnated Rhus microphylla, So, then, a “true 
Lobadium with pinnated leaves ” would be expected to display, 
as all others of that genus do, leaflets ample, strongly indented 
on the margin, and conspicuously veiny ; and we have, moreover, 
a plain and certain foreshadowing of what such leaves would be 
in S. subpinnata of Colorado, and S. guinata of California, in 
neither of which is there a hint, even remote, of the peculiar 
foliage of Rhus microphylla, which itself is most like that of 
xerophyte leguminous shrubs of the deserts of all continents. 
And the inflorescences in the present type are only rather 
superficially like those of Schmaltzia. They are solitary always, 
and sessile; one in each axil. Each flower in the spike is 
embraced at base by a cup formed of three bracts, while in 
Schmalizia each is axillary to a single bract. The flowers in 
this type are never yellow, always white, and the petals are 
ciliate, The fruits, always orange or scarlet in Schma/tzia, are 
dark purple or black in the present type, which I regard as an 
excellent genus and name it RHOEIDIUM. 
R. MICROPHYLLUM (Engelm). Leaflets 4 to 7, oval, the lowest 
pair distinctly smaller but still oval, only slightly inequilateral, 
both faces of all scantily villous-strigulose. 
Widely dispersed in western Texas, doubtless also across 
the Rio Grande in Mexico; the typé Charles Wright’s n. 1341. 
In middle Texas, on the border region between the arid and the 
humid sections, there is another species. 
R. @LaBELLUM. Leaflets 9, larger, elliptic-oblong, the odd 
one not larger than the pair next it, the lowest pair slightly 
obovate, obtuse, slightly yet distinctly unequal at the not rounded 
base, àl] appearing glabrous above and very smooth, a lens show- 
ing scattered stiff appressed hairs. 
