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 Milk- 

 weed. 

 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. 



POLEMONIACE.ai. 



Polemonium Family. 

 t Phlox paniculata, L. 



Middle of July to middle of Au<just. 



t Phlox maculata, L. Wild Sweet-William. 



Falls Church (Professor Chickering); Eeform School; Back Lick Eun, Va. ; not 

 common. Second week in May. 



t Phlox pilosa, L. 



llorndoii, Va., May 27, 1878 (Professor Chickering). 



t Phlox divaricata, L. 



April, May. Autumnal flowers, October 16, 1873. 



