Bulletin - United States National Museum - Smithsonian Institution
Bulletin - United States National Museum - Smithsonian Institution
Bulletin - United States National Museum - Smithsonian Institution
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FLORA OF WASHINGTON AND VICINITY. 65<br />
Nasturtium lacustre, Gray. Lake- Cress.<br />
Only found in one of the numerous pools among the rocks below Great Falls. In<br />
flowering time, at the end of June, it presents three kinds of leaves. The pond in<br />
which it has been submersed during the spring, and where it has borne only dissected<br />
leaves, is then dry, and the long stems lie prostrate on the muddy bottom<br />
with the whorls of these leaves adherent to them. At the base a rosette of broad,<br />
green leaves, more or lesslobed orlyrate, springs up, while the upper portion of the<br />
stem below the flowers bears small, lanceolate or oblong, entire leaves.<br />
Nasturtium. Armoracia, Fries. Horse-Radish.<br />
Very sparingly escaped.<br />
Barbarea vulgaris, R. Br. Winter-Cress.<br />
Early in April.<br />
Barbarea prcecox, R. Br. Early Winter-Cress. Scurvy-Grass.<br />
First week in April. Rosettes of radical leaves develoj) during the winter.<br />
tArabis lyrata, L. Rock-Cress.<br />
On much exposed rocks. The radical leaves can only be obtained very early in<br />
April or even in March. April.<br />
Arabis dentata, Torr. and Gray.<br />
High Island and islands above; also South shore of the Potomac. April.<br />
Arabis patens, Snlliv.<br />
Sandy Landing. Rare. Middle to end of April; pods persistent until August.<br />
Arabis hirsuta, Scop.<br />
Near Sandy Landing. Mr. C. S. Sheldon, May 22, 1881; then with young fruit,<br />
t Arabis laevigata, Poir. Tower-Mustard.<br />
April.<br />
tArabis Canadensis, L. Sickle-Pod.<br />
Third week in May; fruit in July,<br />
t Cardamine rhomboidea, DC. Spring-Cress.<br />
Early in April,<br />
t Cardamine hirsuta, L. Bitter Cress.<br />
Always wholly glabrous. First week in April. Autumnal flowers collected Octo-<br />
ber 3, 1880.<br />
t Cardamine hirsuta, L., var. sylvatica, Gray.<br />
A much smaller plant than the last, and apparently distinct. Pleasantly flavored.<br />
First week in April.<br />
tDentaria heterophylla, Nutt. Diverse-leaved Toothwort.<br />
Virginia shore of the Potomac, above Georgetown. Middle of March to middle<br />
of April.<br />
tDentaria laciniata, Muhl. Cut-leaved Toothwort.<br />
Middle of March to middle of April. When this species and the last are found<br />
growing together there is a diflereuce of a week in their flowering time, this being<br />
the earlier.<br />
Draba ramosissima, Desv. Branching Whitlow-Grass.<br />
Rocks at Harper's Ferry ; may be looked for nearer. May 30, 1873.<br />
Bull. Nat. Mus. No. 22 5