72 ALLIONIACEAE. 



Involucre wanting or imperfect. 3. Boerhaavia. 

 Shrubs or trees : embryo straight. 



Fruits without glands. 4. Torrcbia. 



Fruits with 5 rows of glands. 5. Pisonia. 



1. MIRABILIS L. Perennial herbs. Leaves opposite. Flowers typically 

 1 in an involucre. Calyx salverform, the limb large. Stamens 3-6: filaments 

 united at the base. Fruit of an ovoid type, constricted near the base. 



1. M. Jalapa L. Plants glabrous, except the young parts: leaf-blades ovate, 

 sometimes broadly so, 3-12 cm. long: involucres 7-8 mm. long; lobes acute: 

 calyx deep-red to purple or white: fruits broadly ovoid. — Cultivated grounds 

 and roadsides. Nat. of Mex., and cultivated. — F. K. {Ber., Bah., Cuba, 



A7lt.) FOUR-0 'CLOCK. 



2. OKENIA Schlecht. & Cham. Annual prostrate herbs. Leaves opjio- 

 site: blades inequilateral. Flowers solitar}- in the 3-bracted involucres. 

 Calyx short-f unnelform, the lobes emarginate. Stamens 14-18 : filaments 

 united at the base. Fruit somewhat elongate, bent, 1-striate and transversely 

 wrinkled, subterranean. 



1. O. hjrpogaea Schlecht. & Cham. Stem and branches creeping, densely 

 viscid-pubescent, 2-11 dm. long: leaf -blades fleshy, ovate to oblong-ovate, 

 2.-5-4 cm. long, obtuse at the apex, truncate or cordate at the base, stout- 

 petioled : corolla deep-blue. — Coastal sand-dunes. — F. K. 



3. BOERHAAVIA [Vaill.] L. Annual or perennial usually diffuse 



herbs. Leaves opposite: blades often undulate. Flowers subtended by minute 



bracts. Calyx campanulate to rotate, the tube not prolonged beyond the 



ovary. Fruit clavate to obovoid, 5-10 ribbed. 



Fruits glandular, rounded at the apex : plants perennial. 1. B. paniculata. 



Fruits glabrous, flat at the apex : plants annual. 2. B. erecta. 



1. B. paniculata L. C. Eich. Stem branched at the base, the branches 

 diffusely spreading, 6-12 dm. long: leaf-blades ovate to oblong-ovate. 2-8 cm. 

 long, both surfaces of almost the same color: calyx pink or purplish; tube 

 glandular-pubescent; limb campanulate, 1.5 mm. high, glabrous or sparingly 

 pubescent: fruits obpyramidal, 3 mm. long, the ribs glandular, the top 

 rounded. — Pinelands and hammocks. — F. K. {Bah., Cuba, Ant.) 



2. B. erecta L. Stem simple below, erect or branched at the base, the 

 branches decumbent or spreading, 3-12 dm. long: leaf -blades ovate to deltoid- 

 ovate, 2-8 cm. long, minutely black-dotted on the lower whitish surface: 

 calyx white or purple; tube glabrous; limb campanulate, 1-1.5 mm. long, 

 sparingly pubescent: fruit obpyramidal, 3.5-4 mm. long, 5-angled, the grooves 

 transversely wrinkled, the top flat. — Cultivated grounds and roadsides. Nat. 

 of Trop. Am. — F. K. {Ber., Bah., Cuba, Ant.) 



4. TOK.RUBIA Yell. Unarmed shrubs or trees. Leaves opposite: blades 

 entire. Flowers in cymes. 



1. T. longifolia (Heimerl) Britton. Leaves' 3-7 cm. long; blades spatulate 

 to obovate, oblong-spatulate, or oval-spatulate : fruits broadly or narrowly 

 obovoid, 5-6 mm. long. — Hammocks. — F. K. {Bah., Cuba, Ant.) — Bloixy. 



5. PISONIA [Plum.] L. Armed woody vines. Leaves opposite: blades 

 entire. Flowers in compound cymes. 



1. P. aculeata L. Stems with spreading thorn-armed branches: leaf-blades 

 elliptic, oval, or ovate, 2.5-7 cm. long: pedicles slender: calyx-lobes mostly 



