FLORA OF THE DISTRICT OF COLUMBIA. 225 



1. Vaccinium vacillans Kalm. Dryland blueberry. 

 Dry fields and woods; common. Apr-May; fr. July. Eastern U. S. 



2. Vaccinium atrococcum (A. Gray) Heller. Early highbush blueberry. 

 Swamps and low sandy woods; frequent. Apr.-May; fr. July. Eastern N. Amer. 



(F. corymbosum of Ward's Flora.) 



3. Vaccinium caesariense Mackenzie. 



Swamps and sandy woods of the Coastal Plain. Apr.-May; fr. July. N. J. to Va. 



4. Vaccinium corymbosum L. Highbush blueberry. 

 Swamps or ravines; Paint Branch Swamp and near TB; rare. May; fr. July-Aug. 



Eastern N. Amer. 



122. PEIMULACEAE. Primrose Family. 



Leaves all basal, the flowers showy, purple or pink, in umbels, on an erect simple 

 naked scape; corolla lobes strongly reflexed. Plants perennial. 



6. DODECATHEON. 

 Leaves borne chiefly on the flowering stems and branches; corolla lobes erect or spread- 

 ing. 

 Ovary partly inferior, obviously united with the calyx tube at maturity, only the 

 lobes of the calyx free; corolla white. Plants perennial, low and weak; leaves 



alternate 1. SAMOLUS. 



Ovary distinctly superior, not united with the calyx; corolla pink, scarlet, blue, 

 or yellow (rarely white in Anagallis.) 

 Plants low annuals; flowers axillary; capsules circumscissile, the top falling off as 

 a circular lid. 

 Leaves opposite, dark-dotted beneath; flowers on pedicels 1-3 cm. long; corolla 

 longer than the calyx; stamens with bearded filaments. 



4. ANAGALLIS. 

 Leaves alternate, not dotted; flowers sessile or nearly so; corolla shorter than 



the calyx; filaments beardless 5. CENTUNCULUS. 



Plants perennial; flowers axillary or not; capsules 2-5-valved. Leaves opposite 

 or whorled . 

 Leaves dotted; staminodia (sterile stamens) wanting; filaments united at the 



base 2. LYSIMACHIA. 



Leaves not dotted; staminodia 5, alternate with the stamens; filaments dis- 

 tinct or nearly so 3. STEERONEMA. 



1. SAMOLUS L. Brookweed. 



1. Samolus floribundus H. B. K. 



Moist, mostly allu\T.al situations; not uncommon along the Canal and the Potomac 

 from Georgetown to Great Falls. July. Widely distributed in N. Amer. {S. 

 valerandi americanus A. Gray.) 



2. LYSIMACHIA L. Loosestrife. 



Stems creeping, commonly rooting at the nodes; leaves roundish. .1. L. nummularia. 

 Stems erect or ascending; leaves lanceolate to oval or ovate. 

 Flowers axillary, on long filiform pedicels; stems simple, the leaves mostly in whorls 



of 4 or 5 (sometimes 3-7) 2. L. quadrifolia. 



Flowers borne in a long terminal small-bracted raceme; stems usually branched, the 

 leaves opposite or rarely alternate 3. L. tarrestris. 



69289—19 ^15 



