72 ALLIONIACEAE. 



Involucre wanting or imperfect. 3. BOERHAAVIA. 

 Shrubs or trees : embryo straight. 



Fruits without glands. 4. TORRI HIA. 



Fruits with 5 rows of glands. 5. PISOMA. 



1. MTB.ABTT.I8 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, 

 Ant.) FQUR-O 'CLOCK. 



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

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

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

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

 wrinkled, subterranean. 



1. O. hypogaea 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 cahipanulate to rotate, the tube not prolonged beyond the 

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



Fruits glandular, rounded at the apex: plants perennial. I. B. panlculata. 



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



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

 diffusely spreading, 6-12 dm. long: leaf -blades ovate to oblong-ovat. L' * m. 

 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. erect* L. Stem simple below, erect or branched at the base, the 

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

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

 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, AM.) 



4. TOEEUBIA Veil. Unarmed shrubs or trees. Leaves opposite: blades 

 entire. Flowers in cymes. 



1. T. longlfolla (Heimerl) Britton. Leaves 3-7 cm. long; blades spatulate 

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

 obovoid, 5-6 mm. long. Hammocks. F. K. (Bah., Cuba, Ant.) BLOI.I.Y. 



5. PI8ONIA [Plum.] L. Armed woody vines. Leaves opposite: blades 

 entire. Flowers in compound cymes. 



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

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



