238 PITTONIA. 
herbage pale and glaucescent or subcinereous, but only 
sparsely short-pubescent: leaves elongated, lanceolate, 4 to 6 
inches long, on short and slender petioles: all the nodes 
floriferous, even the lowest: umbels few-flowered and the 
flowers very small: hoods stout, thick, solid almost through- 
out, the lamellar upper part short but rather ample: anther- 
wings narrow, not very notably angular: follicles long, lan- 
ceolate, acuminate. 
A Mexican species, obtained in the State of Nuevo Leon 
by Mr. Pringle in 1889, and since then by others; all dis- 
tributed, most carelessly, as Asclepias longicornu. — 
7. P. AUSTRALE. Flowers few in the umbels, larger than 
in the last: solid part of hood thick, lamellated upper por- 
tion broad and short: anther-wings quite broad, and broadest 
decidedly below the middle. i 
Collected by C. Wright, on the U. S. Exploring Expedi- 
tion, in Nicaragua. 
Ture Genus CHAMACRISTA, 
In the early years of my herborizing in these Eastern 
States, no summer-blooming herbs had so strong a fascina- 
tion for me as our annual sensitive-leaved Cassias; and 
after very many years of travel and residence afar beyond 
their habitat, I but lately renewed acquaintanco with them. 
In the far West and Southwest I had, in the long interval, 
grown familiar with other Cassias of different habit, different 
foliage, and different flowers, insomuch that on first beholding 
again a luxuriant growth of what is called C. chamæcrista 1n 
full flower, I found its floral structure not only obviously very 
unlike that of typical Cassia species, but even very perplex- 
ing. In order that each one of my readers, even those not 
conversant with the plan of the flower in leguminous plants, 
may see how I could be perplexed in this instance, I must - 4 
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