Part 3, 1918] ALLIONIACEAE 243 
pair usually very unequal, the blades succulent, entire or sinuate-lobed. Flowers perfect, 
capitate, few or many in each head, the heads long-pedunculate, each subtended by usually 5 
distinct scarious bracts; perianth funnelform, the tube slender, elongate, constricted above the 
ovary, the limb 5-lobate, the lobes induplicate-plicate, bilobate, the perianth withering and 
often persistent after anthesis. Stamens usually 5; filaments capillary, unequal, connate at 
the base, above adnate to the perianth-tube; anthers linear-oblong, included. Ovary ovoid; 
style filiform, the stigma fusiform, included. Anthocarp turbinate or biturbinate, coriaceous 
or indurate, eglandular, deeply lobed or winged, the wiugs or lobes 2-5. Seed adherent by 
the testa to the pericarp; one of the cotyledons broad, concave, enclosing the farinaceous endo- 
sperm, the other abortive; radicle exterior, elongate, descending. 
Type species, Abronia umbellata Lam. 
Perianth yellow. I. Latifoliae. 
Perianth white, pink, or purplish-red. 
Fruits, at least most of them, winged. III. Umbellatae. 
Fruits not winged, usually deeply lobed, the lobes often compressed and 
winglike, but the central cavity extending quite to their edges. 
Plants acaulescent or nearly so, perennial, cespitose, with branched 
catudices. IV. Nenae. 
Plants with elongate stems, annuals or perennials, never cespitose. 
Perianth deep dark-red; prostrate seacoast perennials. II. Maritimae. 
Perianth white, pink, or purplish-red. 
Flowers 3 or 4 in each head; fruits not lobed; perianth purplish- 
red. Ill. Umbellatae. 
Flowers numerous in each head; most of the fruits deeply lobed. 
Plants perennial; perianth white, or abnormally purplish-red 
in one species; bracts usually large and broad. V. Fragrantes. 
Plants annual; perianth usually purplish-red, sometimes 
white inside but always reddish outside; bracts small and 
narrow, lanceolate or lance-linear. VI. Turbinaiae. 
I. LATIFOLIAE 
A single species. 1. A. latifolia. 
II, MARITIMAE 
A single species. 2. A. maritima. 
III. UMBELLATAE 
Fruits all exalate; flowers 3 or 4 in each head. 3. A. alpina. 
Fruits all or mostly winged; flowers numerous in each head. 
Wings of the fruit 2; bracts broadly ovate or orbicular-ovate. 4. A. pogonantha. 
Wings of the fruit usually 3-5; bracts commonly lance-ovate to narrowly 
lanceolate. 
Perianth about 12 mm. long. 
Wings of the fruit broad, widest above, prolonged above the body 
of the fruit and acute. : 7. A. acutalata. 
Wings of the fruit narrow, widest at the middle, narrowed upward : 
and not prolonged above the body of the fruit. 8. A. brevi flora. 
Perianth 15 mm. long or longer. . 
Limb of the perianth white; erect or procumbent perennial of the ; 
interior plains and hillsides. ee 13. A. mellifera, 
Limb of the perianth purplish-red, or abnormally white in some 
prostrate seashore plants. . 
Perianth-tube 16-20 mm. long; stems densely villous; annual : 
plant of interior plains and hillsides. 5. A. pinetorum. 
Perianth-tube 10-14 mm. long. . ; 
Stem and perianth densely long-villous; body of the fruit 
strongly rugose-veined, the coarse veins extending into : 
the wings; plant of interior plains and foothills. 6. A. villosa. 
Stem and perianth glabrous, puberulent, or sparsely. short- 
villous; body of the fruit not rugose-veined; plants of 
seashores. 
Wings of the fruit indurate and woody. 9. A. alba. 
Wings of the fruit thin and soft. 
Wings of the fruit truncate or narrowed above, not 
prolonged above the body, the whole fruit usually 
longer than broad; Jeaf-blades entire or nearly so; 
stems viscid-puberulent or glabrate. 10. A. umbellate. 
Wings of the fruit rounded or acutish at the apex, pro- 
longed above the body, the fruit often broader 
than long. . 
Stems copiously villous; leaf-blades sinuate-lobed - 
or undulate; bracts ovate or lance-ovate. 11. A. gracilis. 
