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Guadalupe Water-nymph is a submerged aquatic annual with slender, branching stems up to about 7 dm long. The opposite, ribbon-like leaves, usually with additional leaves in their axils, are 0.5-2 cm long and have minutely toothed margins and enlarged bases. Tiny unisexual flowers, both male and female on the same plant, are borne singly, without stalks, in the axils of leaves. The male flowers h...

Water Star-grass is a submerged or partially floating, herbaceous perennial with long, flaccid stems that root at the nodes. The alternate, linear leaves are 7-15 cm long and have membranous wings at the base that clasp the stem. The solitary flowers are borne on stalks that elongate out of a tubular sheath, or spathe, that is borne in the upper leaf axils. Each small, yellow flower has 3 each o...

Deciduous trees in the family Simaroubaceae, native to China.

Short-seeded Water-wort is a tiny, glabrous annual, growing submerged or exposed, that roots freely at the nodes and forms small mats. The opposite, linear- to spatula- shaped, entire margined leaves are usually less than 1 cm long. The minute flowers are borne solitary and sessile in the leaf axils and have sepals, petals, and stamens in sets of 2 or 3, and a single pistil. The mature fruits ar...

Geyer's Milkvetch is a small annual herb with simple or branched stems arising 5-20 cm high from a slender taproot. The pinnately compound leaves are 2-10 cm long with 5-13 linear to narrowly elliptic leaflets. Foliage is sparsely hairy. Ascending flower stalks arise from the leaf axils and are 6-25 mm long with 2-8 flowers. Each nodding pea-like flower is 3-15 mm long with a somewhat recur...

Spalding's Campion is a perennial with a simple or branched rootcrown. There are 4-7 pairs of sessile, broadly lance-shaped leaves that are 6-7 cm long below and gradually reduced in size upward. Herbage is long-hairy and very sticky. There are few to many flowers in a leafy, somewhat open inflorescence. The tubular calyx is ca. 15 mm long, has 10 nerves on its surface, and is very sticky....

James Stitchwort is a rhizomatous, perennial herb with weak stems that can easily be detached from the rhizomes; the stems are erect or ascending, 1.5-5 dm tall, and 4-angled with swollen nodes. The upper stem, inflorescence, and often the leaves have small, glandular-tipped hairs, while the lower stems are usually hairless. The leaves are opposite, stalkless, lance-shaped with long tapering, po...

Blunt-leaved Pondweed is an aquatic, rhizomatous perennial with slender, submergent, or floating stems that are up to 100 cm long. The leaves are linear, 3-10 cm long, and 2-4 mm wide, each with a small round gland on either side at the base. There is a white-membranous leaf stipule that surrounds the stem above the point where the leaf diverges. Herbage is glabrous. The minute flowers are borne...

Chaffweed is a low, annual herb with prostrate or erect stems, 2-10 cm long, that root at the nodes. The alternate leaves, 5-10 mm long, are egg to spoon-shaped with entire margins. Foliage is glabrous. Solitary, inconspicuous flowers on short stalks occur in the leaf axils. Each flower has a deeply 4-lobed calyx, 2-3 mm long, and a small, pink, 4-lobed, tubular corolla, ca. 1 mm long, that with...

Columbia lewisia is a succulent, glabrous perennial with several leafless stems, 5-15 cm (2-6 in) high, from a fleshy, unbranched rootcrown. Strap-shaped basal leaves are up to 4 cm (1 in) long. Stems have small leaf-like bracts with entire or toothed margins. Flowers are borne on short stalks subtended by a small gland-toothed bract in a branched, open inflorescence. Each flower has 2 glandular...