Bulletin - United States National Museum - Smithsonian Institution

98 FLOEA OF WASHINGTON AND VICINITY.
t Asclepias quadrifolia, Jacq. Fotjr-lkaved Milkweed.
Very handsome and should be cultivated if possible. Not common. Last of May.
t Asclepias verticillata, L. Whorled Milkweed.
Foliage very pretty and delicate. Deserves more attention from floriculturists.
July.
t Acetates viridiflora, Ell. IGomphocarpus, Benth. & Hook., Gen. PL] Green Milkweed.
July.
tEnslenia albida, Nutt. Enslen's Vine.
High Island; Mt. Vernon (Professor Chickering), where only it has been observed
to fruit. Last half of July.
Gonolobus obliquus, R. Br. False Choke-dog.
Eock Creek ; High Island. First half of June. A green-flowered variety of this
species occurs on High Island along with the type.
tGonolobus hirsutus, Michx.
Insane Asylum ; Hunting Creek. First half of June.
GENTIANACEiE.
Gentian Family.
tSabbatia angularis, Porsh. American Centaury.
Last week in July or early in August. For certain peculiarities of this plant, see
the Gardener's Monthly for September, 1878, p. 278, and the American Entomologist
for April, 1880, p. 88.
t Gentiana Saponaria, L. Soapwort-Gentian.
September.
Gentiana Andrewsii, Griseb. Closed Gentian.
Not common. Last of September or first of October.
t Gentiana ochroleuca, Froel. Yellowish-white Gentian.
September.
tBartonia tenella, Muhl. Screw-stem.
Eeform School. Last half of July.
t Obolaria Virginica, L. Pennywort.
March, April.
t Phlox paniculata, L.
Middle of July to middle of Au