Leprgour, who gives as its locality, alpine and subalpine 
situations of the Altai mountains at the verge of perpetual 
snow, never descending below four thousand feet above the 
level of the sea. The Genus was founded by Mr. Brown, 
on the Carpamine nivalis of Pautas ; and a second species, 
which is figured and described in Bot. Miscellany, (v. 1. p. 
341, tab. 68,) was detected by Mr. Davin Dovetas, about 
the Columbia and Wallawallah rivers, N. W. America. I 
am aware, indeed, that Mr. Nurratz has referred this latter 
to anew Genus, Pacnyroprum,* and he expressly says it 
differs from Macroropium “ in the very short stipe of the 
siliqua, and in the incumbent cotyledons.” But the young 
fruit on my specimens does not exhibit a very short stipes 
(the perfect fruit I have not seen), and the habit is so en- 
tirely that of Macroropium, that I should be very unwilling 
to separate it from that Genus on slender grounds. 
Descr. Root perennial, creeping. Plant herbaceous, 
glabrous. Stem simple. Root-leaves large, oval-lanceolate, 
obtusely serrated, on long petioles. Stem-leaves sessile, 
lanceolate, entire. Spike long, of copious horizontal, or, 
soon deflexed, nearly sessile flowers. The very short pedz- 
cel is thickened where it receives the calyx. Sepals four, 
equal, erect, oblong, pale-green. Petals much longer 
than the calyx, erect, white, linear-spathulate, long, nar- 
row. Stamens six, tetradynamous. Anthers oblong, green- 
ish-yellow. Pistil terete, tapering below into a long pedi- 
cel or stipes. Fruit, a pendent siliqua, flattened and slightly 
falcate, stipes from half to three-quarters of an inch long. 
Seeds orbicular, compressed, smooth. 
* See Torrey and Gray’s Fi. of N, Am. v. 1. p- 96. 
Fig. 1. Flower. 2. Petal. 3. Stamens and Pistil:—magnified. 4. 
Fruit :—nat. size. 5. Seed :—magnified. 
