Vol. 32, pp. 129-132 June 27, 1919 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON SUMMARY OF NOTES ON WINTER BLOOMING AT WASHINGTON, D. C. BY W. L. McATEE. The very mild winter of 1918-1919 has resulted in various unusual phenomena of plant bloom in the neighborhood of Washington, D. C, which inspire interest in similar records in the past for this vicinity. Ward in his Guide to the Flora of Washington 1 recognizes only early flowering, and autumnal flowering (meaning a distinct second blooming season) as unusual bloom phenomena. Another categorj^ would seem to be needed to include those plants with long-persistent flowers or a habit of producing new flowers up to the extreme limit of endurance of the unfavorable conditions of approaching winter. For this phenomenon and present purposes, the simple term "late-flowering" will suffice. It is most satisfactory to group by themselves also, those plants that bloom at any time conditions are favorable. Autumnal Flowering. 2 As used here autumnal flowering means a distinct new period of bloom for plants normally blooming earlier in the year. This has been observed 3 in the following plants: Hair grass (Agrostis hyemalis) November 12, 1876. Chickweed (Stellaria aquatica) December 8, 1918. Hepatica (Hepatica triloba) December 22, 30, 1918. Buttercup (Ranunculus abortivus) November 28, 1875. Bitter Cress (Cardamine hirsuta) October 3, 1880. Dewberry (Rubies villosus) September 22 and October 27, 1878. iBul. 22, U. S. Nat. News. 1881, pp. 26-33. 2In this and other sections of the paper are included notes kindly furnished by various individuals, to whom acknowledgment is here gratefully recorded. SNotes of Ward, L. F. Loc. cit.. also Field and Forest, III, Nos. 10-12, April-June, 1878, p. 172. and Chickering, op. cit. I, Nos. 5-6, Oct.-Nov., 1875, pp. 43-44 are incorporated. 25— Proc. Biol. Soc. Wash., Vol. 32, 1919. (129)
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