592 ONAGRACEAE 



cm. long; sepals and petals about 1 mm. long; capsules erect, flat, glabrous or 

 nearly so, 6-12 mm. long. Low sandy soil: Wash. Ida. Utah Calif. Mont* 

 Je-Au. 



6. ISNARDIA L. MARSH PURSLANE. 



Succulent caulescent herbs, with creeping or floating stems. Leaves few, 

 petioled, opposite. Flowers perfect, axillary, sessile. Hypanthium not pro- 

 duced beyond the ovary. Sepals 4, erect and persistent. Petals 4, small, red- 

 dish, or wanting. Stamens 4, with short filaments. Capsule short, truncate at 

 the apex, mostly obpyramidal or obovoid. Seeds without a coma. 



1. I. palustris L. Stem branching, 1-5 dm. long; leaf-blades oval, ovate, 

 or spatulate, 1-2.5 cm. long, slender-petioled ; flowers solitary; bractlets none; 

 sepals triangular, acute; capsule 4-sided, slightly longer than broad, 3-4 mm. 

 long. Muddy places and shallow water: N.S. Fla. Calif. Ore.; Mex. and 

 the Old World. 



7. BOISDUVALLIA Spach. 



Erect caulescent annuals. Leaves alternate, simple, sessile. Flowers in 

 leafy spikes. Hypanthium produced above the ovary into a funnelform de- 

 ciduous tube. Sepals 4, erect. Petals 4, sessile, 2-lobed, purple or white. 

 Stamens 8, those opposite the petals shorter; anthers all perfect, oblong, attached 

 near the base. Styles filiform; stigma with 4 cuneate lobes. Capsule oblong, 

 membranous, 4-celled, 4-valved to the base. Seeds without a coma, smooth. 



Capsule loculicidal, a considerable portion of the septa remaining attached to the valves 



at dehiscence; leaves mostly alike. 



Leaves ovate or ovate-lanceolate, dentate, glabrous or nearly so. 1. B. glabella. 

 Leaves narrowly lanceolate, entire or remotely denticulate, softly pubescent. 



2. B. parviflora. 



Capsule septicidal; septa adherent to the placenta, rendering the latter 4-winged; upper 

 floral leaves broader. 3. B. salicina. 



1. B. glabella (Nutt.) Walp. Stem 1-3 dm. high, simple, or branched 

 near the base, glabrous or nearly so; leaves and bracts 1-2 cm. long, acute, ser- 

 rulate; corolla about 2 mm. long, violet; capsule slender, nearly straight, about 

 7 mm. long, 4-ribbed, seeds sub-fusiform, about 1 mm. long. Damp ground: 

 Sask. Nev. Calif. B.C. Plain Submont. Je-Jl. 



2. B. parviflora Heller. Stem 1-3 dm. high, branched below, pubescent, 

 with spreading white hairs; leaves 1-2.5 cm. long; petals red, about 3 mm. long; 

 capsule about 7 mm. long, slightly curved; seeds somewhat flattened. Sandy 

 soil: Wash. Ida. Ore. Submont. My-Au. 



3. B. salicina (Nutt.) Rydb. Stem simple, 2-5 dm. high, grayish strigose; 

 leaves linear or linear-lanceolate, 2-3 cm. long, canescent, entire-margined or 

 nearly so; bracts ovate-lanceolate or ovate, 1-2 cm. long; corolla 4-5 mm. long, 

 purple or rarely white; capsule about 1 cm. long, slightly 4-angled; seeds con- 

 cave on the inner face. Oenothera densiflora @ T. & G. 0. salicina Nutt. Low 

 ground: B.C. Ida. Ore. Plain Submont. Jl-S. 



8. CLARKIA Pursh. CLARKIA, PINK FAIRIES. 



Annual caulescent, brittle herbs. Leaves alternate, narrow. Flowers 

 showy, in terminal racemes, perfect. Hypanthium produced beyond the ovary 

 into an obconic tube, which is deciduous. Sepals 4, reflexed. Petals 4, clawed, 

 3-cleft, purple. Perfect stamens 4, with a linear scale at the base on each side; 

 the alternate ones rudimentary, filiform ; perfect anthers oblong. Stigmas with 

 4 broad lobes. Capsule elongate, 4-angled, 4-celled, and 4-valved to the middle. 

 Seeds angled or margined, without a coma. 



1. C. pulchella Pursh. Stem 2-6 dm. high, puberulent; leaves linear- 

 lanceolate to linear, 3-7 cm. long, entire, glabrous or nearly so; calyx 1-1.5 cm. 

 long; petals purple, 12-25 mm. long, with long slender claws and 3-cleft limb; 

 capsule linear, 16-24 mm. long, 8-angled. Dry plains and hillsides: B.C. 

 Alta. Mont. Ore. Son. Submont. Je-Jl. 



