2. C. arvénse, L. (FIELD CHICKWEED.) Perennial; stems ascending or erect, tufted, downy or nearly smooth, slender (4--8´ high), naked and _few--several-flowered_ at the summit; _leaves linear or narrowly lanceolate_; petals obcordate, more than twice the length of the calyx; _pods scarcely longer than the calyx_.--Dry or rocky places. May--July. (Eu.) Var. oblongifòlium, Holl. & Britt. Usually taller, pubescent; leaves narrowly or broadly oblong or oblong-lanceolate; pod about twice longer than the calyx. (C. oblongifolium, _Torr._)--Rocky places, N. Y. to Minn., and southward.--Var. VILLÒSUM, Holl. & Britt. Similar but densely villous-pubescent, and the leaves lanceolate to ovate-lanceolate.--E. Penn. 10. SAGÌNA, L. PEARLWORT. Sepals 4 or 5. Petals 4 or 5, undivided, or often none. Stamens as many as the sepals, rarely twice as many. Styles as many as the sepals and alternate with them. Pod many-seeded, 4--5-valved to the base; valves opposite the sepals.--Little, matted herbs, with thread-like or awl-shaped leaves, no stipules, and small flowers terminating the stems or branches; in summer. (Name from _sagina_, fattening; previously applied to the spurry.) [*] _Parts of the flower in fours, rarely with some few in fives._ 1. S. procúmbens, L. Annual or perennial, _depressed or spreading_ on the ground, glabrous; leaves linear-thread-shaped; _apex of the peduncle often hooked_ soon after flowering; _petals shorter than the_ broadly ovate obtuse _sepals_, sometimes none.--Springy places and damp rocks, coast of Maine to Penn. (Eu.) 2. S. apétala, L. _Annual, erect_ or ascending; leaves ciliate at base or glabrous; _petals none_ or very small; _peduncles always erect_.--Dry soil, Mass. to Penn.; scarce, seemingly native? (Eu.) [*][*] _Parts of the flower in fives, the stamens not rarely 10._ 3. S. decúmbens, Torr. & Gray. Annual, ascending; the peduncles and calyx with the margins of the upper leaves _at first glandular-pubescent_; leaves short, often bristly-tipped, not fascicled in the axils; peduncles slender; _petals equalling or shorter than the calyx_; pod oblong-ovate, nearly twice longer than the acutish sepals. (S. subulata, _Man._, not _Wimm._)--E. Mass., to Ill., Mo., and southward.--Var. SMÍTHII, a slender form, _apetalous_, at least in the later flowers.--Near Philadelphia, in waste ground, and in sandy fields at Somers' Point, N. J., _C. E. Smith._ Seeds minutely roughened. 4. S. nodòsa, Fenzl. Perennial, tufted, glabrous, or glandular above; stems ascending (3--5´ high); lower leaves thread-form, the upper short and awl-shaped, with minute ones _fascicled in their axils so that the branchlets appear knotty, petals much longer than the calyx._--Wet sandy soil, along the coast of Maine and N. H., also Lake Superior, and northward. (Eu.) 11. BÙDA, Adans. SAND-SPURREY.