CATALOGUE. 189 
lower part of the rootstock decaying, the remaining part throws out 
annually numerous strong fibres. The root of A. Mexicana ought to be 
compared with it. 
GEN TIANEZ. 
By Dr. GEoRGE ENGELMANN. 
Eryrur@a catycosa, Buckley; Gray, Synops. 113.—Simple or branch- 
ing from an annual or biennial base; erect stems quadrangular-winged; 
leaves linear-lanceolate (about 1’ long), lower ones broader, as long or longer 
than the internodes; panicle rather contracted, loose-flowered; pedicels as 
long as or longer (or the upper ones shorter) than the large flowers (8-10 
in diameter, rose-colored, with yellow centre); calyx about the length of 
the flower-tube; lobes of corolla oblong, acutish, often denticulate, scarcely 
shorter than their tube; seeds small, 0.3—-0.4™™ long. 
In the Gila Valley, Rothrock, 1874 (325), and southeastward into 
Mexico, Gregg, etc.—Stems 1-1}° high, the tallest of our species; leaves 
1-14’ long, distinguished by its large bi- or tri-colored flowers with acutish 
lobes. EE. venusta, Gray, with which it has been confounded, is a smaller 
plant with larger deeper-colored flowers, broader obtuse corolla-lobes, and 
usually longer anthers and larger seeds——The anthers of the different species 
of Erythrea are of different shape and size, from orbicular and oval to oblong 
and linear and 3-4 or 5™™ in length; all become at last spirally twisted 
after they have shed their pollen, the longer more conspicuously so, the 
shorter much less. The stigmas of this genus have often been misunder- 
stood, probably because mostly observed in dried and pressed specimens. 
They are never capitate or funnel-shaped, but always bilobed. Before 
maturity, they remain closed, and only after the anthers have shed their 
pollen do both halves separate and spread out, just as the Gentians behave. 
In the form of the stigma, I find valuable characters for grouping of the 
species, and especially for the distinction of the American ones from those 
of the Old World. The stigmas of the former are flabelliform and broader 
than long; those of the latter are orbicular-ovate or oblong to linear; 
shortest in EZ. spicata and linearifolia, and longest in major, where they are 
twice as long as wide, and in maritima, in which the length is 3 or 4 times 
