Bulletin - United States National Museum - Smithsonian Institution

62 FLORA OF AVASHINGTON AND VICINITY.
tRanunculus ambigens, Watson. [/?. aUsmwfoUus, Geyer. ] Water-Plantain
Spearwort.
Eastern Branch Marsh ; also, marsh near the mouth of Hunting Creek, Middle of
Jane; fruit in July.
tRanunculus pusillus, Poir. Small Spearwort.
A reiirarkablo form having large floating leaves on long petioles, resembling those
of a Poiamogeton, was found April 30, 1881, in a jiartially dried pond near the First
Lock of the Canal. As the locality had been repeatedly examined before, its recent
introduction there seems probable. The typical form occurs on the Potomac Flats
above Eads' Mill.
tRanunculus abortivus, L. Small-flowered Crowfoot.
April and May.
Ranunculus abortivus, L., var. micranthus, Nutt.
High Island. April. Autumnal flowers, November 28, 1875.
tRanunculus sceleratus, L. Cursed Crowfoot.
Early in May.
tRanunculus recurvatus, Poir. Hooked Crowfoot
First half of May ;
fruit in June.
tRanunculus repens, I^. Creeping Crowfoot.
April. Two marked varieties occiir, one upland, small and early blooming and
disappearing; the other in damp ground, glabrous, later, and much larger; throw-
ing out long runners and surviving through the summer. Still a third form spar-
ingly found in wet, springy places, with large, shining, spotted leaves, very late
flowering (third week in May), runners constituting the greater part of the plant,
and the flowers rarely setting fruit. The last found only in one place between
Chain Bridge and Fort Ethan Allen. The two following probably cover these ex-
tremes.
tRanunculus repens, L., var. hispidus, T. & G.
Early in April ; fruit iu May.
tRanunculus repens, L., var. nitidus. Chapman.
May ; fruit in June or July.
tRanunculus hidbosus, L. Buttercups.
May.
tRanunculus acris, L. Tall Ckowfoot.
Early iu June.
t Aquilegia Canadensis, L. Wild Columbine.
End of May.
Delphinium tricorne, Michx. Dwarf Larkspur.
Found only on the second of the chain of islands in the Potomac above the
Feeder Dam. Middle to end of April.
Delphinium Consolida, L. Field Larkspur.
Sparingly escaped and depauperate in form. July.
tAconitum uncinatum, L. Wild Monkshood.
Last half of September.