WEST AMERICAN CRUCIFERA, 89 
pinnate character of a solitary leaf, at least in the pressed spec- 
imens. 
Corresponding to the last in habitat, bnt having a more north- 
erly range in the Sierra, and still passing for a Streptanthus, 
though of floral character most anomalous in the crucifere, is 
what I wish to designate as 
MICROSEMIA POLYGALOIDES. S. folygaloides, Gray. The re- 
markable peculiarity of one large colored banner-like sepal stand- 
ing nearly upright in expansion, and in bud folded down over all 
the others and enclosing them, was first described by the writer, 
Pittonia, ii. 46, and again in the Flora Franciscana, p. 262. 
Among fifty accomplished taxonomists, perhaps not one, with 
a mere spike of such flowers before him, and „without other evi- 
dence, would guess this plant to be a crucifer, or believe it to be 
such until he had dissected it. It belongs, indeed, in the same 
tribe of crucifers as Strepfanthus, but is as remote from that 
genus as is possible within such tribal limits. 
Not as much can be said of the following type, which is 
apparently as peculiar to the Coast Range as Microsemia and 
Mitophylium are to the Sierra Nevada. The type species is my 
Streptanthus barbiger; and there are two congeneric species 
known to me that are hitherto undescribed. 
These plants have a glabrous glaucescent herbage, and all 
except the very lowest and somewhat lanceolate and toothed 
leaves are narrow and entire. The habit, and the spicate flow- 
ers are points of contact with Microsemia; but the calyx is 
perfectly that of Ple‘ocardia, being quite as herbaceous and close- 
fitting, with tips of sepals even more prolonged, recurved and 
white-margined, but there is no more hint or trace of the round- 
ed bracts subtending the inflorescence here than there is in 
Microsemia, in which latter I am persuaded the plants have, as 
I think, their nearest ally despite the fact that none of the 
species show any sign of that strange metamorphosis of sepals 
characteristic of that type. 
Alluding, in the generic name, to habitat of this little group, 
I name the type species : 
MESOREANTHUS BARBIGER. S. barbiger, Greene, resting it 
LEAFLETS, Vol. i, pp. 89-96, Dec. 81, 1904. 
