FLORA. OF THE DISTRICT OF COLUMBIA. 225 



1. Vaccinium vacillansKalrn. 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. 



(V. 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. PKIMULACEAE. 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. CENTUNCTJLTJS. 



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

 or whorled. 

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



b ase 2. LYSIMACHIA. 



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

 tinct or nearly so 3. STEIRONEMA. 



1. SAMOLTJS L. Brookweed. 



1. Samolus floribundus II. B. K. 



Moist, mostly alluvial 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. nummularis. 

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



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



of 4 or5 (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. tsrrestris. 



69289—19 15 



