230 NORTH AMERICAN FLORA [VoLuME 21 
lent or short-pilose or glabrate; inflorescence cymose, the cymes usually small and congested, 
or open in age, often leafy, the branches very slender, viscid-pilose; involucres few, on long or 
short, slender peduncles, about 3 mm. long in anthesis, in fruit 5-6 mm. long, green, viscid- 
pilose, the lobes triangular-ovate, unequal, usually acute or acuminate; perianth 6-8 mm. 
long, purplish-red, viscid-pilose; stamens usually 3, short-exserted; fruit obovoid, 3.5~4 mm. 
long, terete, dark-brown or blackish, short-pilose, sparsely and irregularly tuberculate; seed 
oval-obovoid, 2.5 mm, long, pale yellowish-brown. 
Type LOocALIty: Cumana, Venezuela. 
DisTRIBUTION: Veracruz and Mexico (State) to Yucatén and Costa Rica; also in Colombia 
and Venezuela. 
EXCLUDED SPECIES 
ALLIONIA CERVANTESII (Sweet) Steud. Nom. Bot. ed. 2. 1: 50. 1840. (Oxybaphus 
Cervaniestt Sweet, Brit. Fl. Gard. 1: pl. 8z. 1825.) Described from cultivated plants said 
to have come from South America. The species has often been reported from Mexico, but 
no North American specimens seen by the writer agree with the original description and 
illustration. 
ALLIONIA coRDATA (Kunze) Kuntze, Rev. Gen. 533. 1891. (Oxybaphus cordifolius 
Kunze; Choisy, in DC. Prodr. 13?: 432. 1849.) Reported doubtfully from Mexico by Choisy 
(in DC. Prodr. 137: 432, 1849). The species appears to be exclusively South American: 
OXYBAPHUS ovatus (R. & P.) Vahl, Enum. 2: 41. 1806. (Calyxhymenia ovata R. & 
P. Fl. Per. 1: 45. 1798.) Reported doubtfully from Mexico by Choisy (in DC. Prodr. 13?: 
431. 1849), but the specimens upon which the report was made were, undoubtedly, wrongly 
identified, the species being a South American one. 
21. ALLIONIELLA Rydb. Bull. Torrey Club 29: 687. 1902. 
Perennial herbs with dichotomous stems, the branches swollen at the nodes, more or less 
glandular-pubescent. Leaves opposite, petiolate, the blades broad, entire or nearly so. 
Flowers involucrate; involucre 3-flowered, broadly campanulate at anthesis, nearly rotate 
when mature and slightly accrescent, green and calyx-like, 5-lobed, the lobes unequal, erect, 
imbricate; perianth short-funnelform, corolla-like, purplish-red, the tube short, stout, con- 
stricted above the ovary, the limb 5-lobed, induplicate-plicate. Stamens 3, unequal; fila- 
ments capillary, free; anthers didymous. Ovary ellipsoid; style filiform, exserted; stigma 
capitate. Anthocarp coriaceous, ellipsoid, smooth or obscurely transverse-ridged, glabrous. 
Seed with the testa adherent to the pericarp; embryo uncinate, the cotyledons enclosing the 
copious farinaceous endosperm; radicle elongate, descending. 
Type species, Quamoclidion oxybaphoides A. Gray. 
1. Allioniella oxybaphoides (A. Gray) Rydb. Bull. Torrey Club 
29: 687. 1902. 
Quamoclidion oxybaphoides A. Gray, Am. Jour. Sci. II. 15: 320. 1853. 
Mirabilis oxybaphoides A. Gray, in Torr. Bot. Mex. Bound. Surv. 173. 1859. 
Oxybaphus Wrightit Hemsl. Biol. Centr. Am. Bot. 3: 3. 1882. 
Allionia oxybaphoides Kuntze, Rev. Gen. 533. 1891. 
Mirabilis oxybaphoides glabrata Heimerl, Ann. Cons. Jard. Genéve 5: 180. 1901. 
Allioniella oxybaphoides glabrata Standley, Contr. U. S. Nat. Herb. 12: 357. 1909. 
Plants ascending or decumbent, from a thick fleshy root, much branched, usually forming 
dense clumps 4-12 dm. in diameter, the branches slender, green or whitish, densely viscid- 
villous with short hairs, or rarely glabrate, the internodes elongate; petioles slender or stout, 
1-4 cm. long, viscid-villous or glabrate; leaf-blades deltoid-cordate or deltoid, often broadly 
so, 1.5-7 cm. long, 1.5—6 cm. wide, usually cordate at the base and broadly short-decurrent, 
sometimes truncate, acute to attenuate at the apex, often abruptly so, entire or undulate, 
thin, bright-green, viscid-villous, especially when young, or glabrate, ciliate; inflorescence 
cymose or axillary, the cymes few-flowered, leafy; peduncles slender, solitary, usually longer 
than the involucres, viscid-villous; involucres about 5 mm. long at anthesis and 1-1.5 em. 
broad in age, viscid-villous, the lobes narrowly or broadly triangular, acute or attenuate, 
