cece 
218 
which is characteristic, as I have said, of the present plant alone, 
of all the genus. : 
PLATYSTIGMA DENTICULATUM. (MMeconella denticulata, Greene, 
Bull. Cal. Acad. ii., 59.) 
Field studies of the past season have brought to light facts in 
abundance to show that it is of little importance in our Papaver- 
acez, whether filaments be flat or filiform. The same species will 
sometimes be found to vary greatly in this respect; and we have 
even Platystigma with filaments as broad and flat as they are ever 
found in Platystemon itself. Meconella has, therefore, nothing 
but its twisted capsules to recommend it for generic rank; and 
the Benthamian view of the limits of Platystigma, adopted by Mr. 
Watson in the Botany of California, is probably the more correct: 
THYSANOCARPUS CONCHULIFERUS.—Glabrous, 3-7 inches 
high, with many divergent branches ; leaves linear, the lower cleft 
into narrow segments, the cauline auricled at base; racemes short 
and rather close; pods a line or more in length, cymbiform, the 
conduplicate margin sinuately parted into spatulate divisions, or 
the latter coherent above, leaving narrowly oblong perforations ; 
style equalling the margin of the pod and commonly coherent with 
it; pedicels nearly divaricate or quite straight, twice as long as 
the pods; flowers not seen. 
Common on mossy shelves and crevices of the high rocky 
summits and northward slopes of Santa Cruz Island. A most in- 
teresting new species, very remarkable in the character of its fruit ; 
showing how nearly our American 7hysanocarpus can approach 
the Asiatic genus Zauscheria and yet remain a perfectly valid 
genus, the very dissimilar Athysanus being excluded. 
ERYSIMUM INSULARE.—Shrubby, diffuse, a foot high, form- 
ing a dense tuft of from 2 to 6 feet broad, cinereous with a 
minute appressed pubescence, or.glabrate; leaves narrowly linear, 
canaliculate, entire, rather rigid, recurved at apex, crowded upon 
the numerous woody branches ; racemes short and dense, on short 
peduncles, or almost sessile; corolla yellow, a half inch broad; 
siliques quadrangular, 2 inches long, 1% to 2 lines thick, beaked 
with a stout style. 
Sandy slopes above Cuyler’s Harbor, Island of San Miguel. 
A very remarkable plant, apparently related to certain Old World 
