Sepals 2, ovate, free, persistent. Stamens 5, adhering to the short claws of the petals. Style 3-cleft at the apex. Pod 1-celled, 3-valved, 3--6-seeded.--Our two species are perennials, sending up simple stems in early spring from a small deep tuber, bearing a pair of opposite leaves, and a loose raceme of pretty flowers. Corolla rose-color with deeper veins, opening for more than one day! (Named in honor of _Dr. John Clayton_, one of our earliest botanists, who contributed to Gronovius the materials for the Flora Virginica.) 1. C. Virgínica, L. Leaves linear-lanceolate, elongated (3--6´ long).--Moist open woods; common, especially westward and southward. 2. C. Caroliniàna, Michx. Flowers rather smaller and fewer; leaves spatulate-oblong or oval-lanceolate (1--2´ long).--Maine to Minn., and southward along the Alleghanies. (Addendum) 3. C. Chamissònis, Esch. Weak, procumbent or ascending, rooting below and perennial by lateral and terminal filiform runners; leaves several pairs, oblong-spatulate, 1--2´ long; inflorescence racemosely 1--9-flowered; petals pale rose-color; capsule small, 1--3-seeded.--In a cold ravine, Winona Co., Minn.; in the mountains from Colorado north and westward. ORDER 17. ELATINÀCEÆ. (WATER-WORT FAMILY.) _Little marsh annuals, with membranaceous stipules between the opposite dotless leaves, minute axillary flowers like those of the_ Chickweeds, _but the pod 2--5-celled, and the seeds as in_ St. John's-wort. The principal genus is 1. ELATÌNE, L. WATER-WORT. Sepals 2--4, persistent. Petals 2--4, hypogynous. Stamens as many, rarely twice as many, as the petals. Styles, or sessile capitate stigmas, 2--4. Pod membranaceous, globose, 2--4-celled, several--many-seeded, 2--4-valved; the partitions left attached to the axis, or evanescent. Seeds cylindrical, straightish or curved, marked by both longitudinal and transverse lines.--Dwarf glabrous plants, usually rooting at the nodes, aquatic or terrestrial. (A Greek name for some obscure herb.) 1. E. Americàna, Arn. Tufted, 1´ high; leaves obovate, obtuse, 1--3´´ long; flowers sessile, rarely opening in the aquatic form; sepals, petals, stamens, and stigmas 2, rarely 3; seeds 5 or 6 in each cell, rising from the base, marked by 9 or 10 longitudinal lines and 20--30 crossbars.--Margin of ponds, etc., N. H. to Ill., Va., and southwestward. Pod very thin and delicate; the seeds large in proportion, straightish. 2. E. triándra, Schkuhr. Leaves oblanceolate or nearly lanceolate; petals and stamens commonly 3; seeds more slender, covering the axis.--Ponds, Ill., Neb., and westward. (Eu.) 3. E. brachyspérma, Gray. Leaves oblong or oval with narrowed base; flowers mostly dimerous; seeds short-oblong, with 6 or 7 longitudinal lines and 10--12 crossbars.--Ill. and southwestward. ORDER 18. HYPERICÀCEÆ. (ST. JOHN'S-WORT FAMILY.)