592 ONAGRACEAE 



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

 nearly so, 6-12 mm. long. Low sandy soil: Wash. — Ida. — Utah — Cahf. 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 deiiiscence; 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 

 groimd: B.C. — Ida. — Ore. Plain — Submont. Jl-S. 



8. CLARKIA Pursh. Clarkia, Pink Fairies. 



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

 show>', in terminal racemes, perfect. Hypanthimn 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. 



