FOUR-O'CLOCK FAMILY 261 



13, A. divaricata R^db. Steins usually solitar}^, erect, 6-10 dm. high; 

 leaf-blades glabrous, linear to linear-lanceolate, acute, 5-10 cm. long; involucres 

 numerous, in terminal cymes, about 1.5 cm. wide; lobes elliptical or oval, obtuse; 

 perianth pink, about 8 mm. wide. Sandy valleys: N.M, — -Colo. — Ariz. Son, — 

 SubmonL Jl-Au. 



9. WEDELif LLA Cockerell. 



Annual or perennial prostrate herbs, with opposite petioled leaves; blades 

 entire, oblique at the base. Flowers perfect, 3 in each involucre, which is com- 

 posed of 3 sepal-like bracts united at the base. Perianth corolla-like, with a 

 short oblique tube and a 4-lobed limb. Fruit leatherj', winged on each side, 

 smooth or rarely crested on the inner face and with two rows of glands on the 

 outer. Seeds filling the pericarp to which it adheres. Endosperm mealy. 

 Stamens 4; filaments slender. [Wedelia Loeffl. Allioiiia L., in part.] 



1. W. incarnata (L.) Cockerell. Perennial; stem diffusely branched at the 

 base, prostrate, 1-5 dm. long; leaf-blades thick, ovate or oblong, 1-3 cm. long, 

 undulate; bracts of the involucre oval or orbicular, 4-6 mm. long, reticulate, 

 ciliate; calyx rose or white, 5-6 mm. long; fruit 3-4 mm. long. AUionia incarnata 

 L. Wedelia incarnata (L.) Kimtze. Valleys: Tex.^Colo.— Utah— Ariz.; Mex.; 

 Trop. Am., and S. Am. Son. -My-N. 



Family 41. TETRAGONIACEAE. Carpet-weed Family. 



with 



Flowers 



in ours perfect, regular. Sepals 4 or 5. Corolla wanting m our species. 

 Stamens 4 or 5, or many, hypogynous. Gynoecium of 2 or more united 

 carpels; ovary 2-several-celIed or by reduction 1-celIcd, superior or partly 

 inferior; styles as many as the cells of the ovary. Fruit a circumscissile or 

 loculicidal capsule. 



Hypanthiura wanting; capsule loculicidal; leaves whorled. 1. Molluqo. 



Hypanthium manifest; capsule circumscissile; leaves opposite. 2. bE&L\iLM. 



1. MOLLUGO L. Indian Chickweed, Carpet-weed. 



Annual herbs, with verticillate leaves and hyaline stipules. Flowers perfect, 

 in axillar>^ clusters, cymes, or racemes, pedicelled, usually white. Sepals 5, per- 

 sistent, with hyaline margins- Stamens 3. opposite the angles of the ovary or 

 5, alternating with the sepals; filaments filiform or subulate. Ovar>' 3-5-celled, 

 superior; styles 3-5, distinct; stigmas entire. Capsule 3-5-valved. 



-J — *_j - 



Annual; stem branched at the base, prostrate, 0.5-3 

 dm. long; leaves m whorls of 4-8, short-pet ioled; blades unequal, spatulate 

 to linear-oblanceolate, 1-3 cm. long, entire; sepals 2 mm. long, oblong ^\ith white 

 margins; capsule oblong or oval, 4-5 mm. long. ^ aste places and cultivated 

 ground: Ont.— Fla.— Tex.-Calif.— Wash.; Mex.; W. Ind., C. Am., and S. Am. 



Plain — Son. Ja-D. 



2. SESUVIUM L. Sea Purslane. 



Annual 



or perennial herbs or shrubby plants, with tleshy opposite leaves, 

 pules Flowers axillary. Hypanthium in oura turbinate. Sepals 

 5, usuaUy horned on the back near the tip. Stamens 1-many, pengynous. 

 Ovary 3-5-celIed, haK-inferior; styles 3-5, distinct, filiform; ovules numerous. 

 Fruit a circumscissile capsule; seeds several or many m each cavity. 



1. S. sessile Pers. Perennial, with a thick root; stems diffuse, branched at 

 the base, prostrate or ascending, 1-8 dm. long; leaf-blades spatulate or oblance- 

 olate, 1-3 cm. long; sepals ovate-oblong, 8-10 mm. long; stamens many; capsule 

 oblong, 6 mm. long. River banks and saline plams: Wyo.— Kans.— lex.— 

 Calif.; Mex. and S. Am. Son. Ap-N. 



