32 FLORA OF WASHINGTON AND VICINITY. 



were actually seen in flower and suflBciently advanced for collection; 

 otherwise no note was taken. The Carices of course had not advanced 

 to developed perigynia, and many plants whose inflorescence is centri- 

 fugal or centripetal, or which develop fruit while retaining flowers, 

 should be looked for at a later stage. 



VI. AUTUMNAL FLOWERING. 



One of the most interesting peculiarities of the flora of this vicinity 

 is that of the second blooming of vernal species, which iq most cases 

 takes place quite late in the fall (See Field and Forest, April- June, 

 1878, Vol. Ill, p. 172). In addition to the seven species observed and 

 published in 1878, I have noted more than as many others manifesting 

 this habit, and it is probable that still others will yet be added. The 

 following is a list of those thus far recorded, with the dates at which 

 observed, and which may be compared with those of their regular ver- 

 nal period : 



Ranunculus abortivus, var. micranthus November 28, 1875 



Cardamine hirsuta October 3, 1880 



Yiola pedata, var. bicolor Sept. 22 and Dec. 8, 1878. 



Viola striata September 10, 1876 



Fragaria Virginiana September 22, 1878 



Eubus villosiis Sept. 22 and Oct. 27, 1878 



Lonicera Japonica October 13, 1878 



Houstonia purpurea October 13, 1878 



Houstonia purpurea, var. angustifolia September 12, 1880 



Houstonia caerulea September 7, 1879 



Vacciuium stamineum October 13, 1878 



Ehododendron nudiflorum October 13, 1878 



Phlox divaricata October 16, 1873 



Sabbatia angularis October 27, 1878 



Echium vulgare October 8, 1880 



Veronica officinalis October 8, 1873 



_ Agrostis scabra. November 12, 1876 



To this list of seventeen should perhaps be added Stellar ia pubera, 

 which, instead of a vernal and an autumnal period, has two vernal pe- 

 riods, as described under that species in the systematic notes. Salix 

 longifolia has this year flowered twice, once in April and again in June.* 



* Mr. M. S. Bebb, under date of June 22, 1881, replying to my inquiry in regard to 

 this phenomenon, says: "The second blooming of S. longifolia is not anomalcsjo; but, 



