244 NORTH AMERICAN FLORA [Vorums 21 
Stems viscid-puberulent or glabrate; leaf-blades 
usually entire; bracts lanceolate or linear- 
lanceolate. 12, A. minor. 
IV. NANAE 
Bracts lanceolate or narrowly oblong, 2 mm. wide; leaf-blades suborbicular 
to ovate. 14, A. Covillei. 
Bracts oval to oblong, 3.5-7 mm. wide. 
Leaf-blades suborbicular to oblong-elliptic, 5-14 mm. wide. 15. A. nana, 
Leaf-blades linear to linear-oblanceolate, 3.5—-4 mm. wide. 16, A. Bigelovii. 
V. FRAGRANTES 
Stems copiously villous or short-villous, at least above. 
Fruit whitish-stramineous, turbinate, often as broad as long, the winglike 
lobes dilated at the apex and flat-topped. 17. A. salsa. 
Fruit dark-olivaceous or brownish, usually biturbinate and much longer 
than broad, the lobes compressed and thin-edged throughout. 18. A. fragrans. 
Stems puberulent or glabrous. 
Bracts rounded or very obtuse at the apex, 10-12 mm. long, 5-7 mm. wide. 
Perianth 18-22 mm. long; leaf-blades usually oval to ovate-oblong, 
longer than wide. . 19. A. elliptica, 
Perianth 12-14 mm. long; leaf-blades, even those of the upper leaves, 
orbicular or nearly so. 20. A. orbiculata. 
Bracts acute to attenuate. 
Stems glabrous or nearly so; bracts 11-15 mm. long; fruit 7-10 mm. 
long, biturbinate. 21. A. glaucescens, 
Stems copiously viscid-puberulent; bracts 4-10 mm. long; fruit less 
than 7 mm. long. 
Perianth about 12 mm. long; bracts 4-5 mm. long, elliptic-oblong 
or lance-ovate. 22, A. ammophila, 
Perianth 13-20 mm. long; bracts 5-10 mm. long. 
Bracts linear-lanceolate or narrowly oval, usually 2-3 mm. wide; 
leaf-blades mostly subcordate at the base; fruit biturbinate, 
6-8 mm. long. 23, A. texana. 
Bracts oval or broadly ovate, usually 4-5 mm. wide; leaf-blades 
very acute to rounded at the base; fruit about 5 mm. long. 
Fruit turbinate, the lobes flat-topped ; leaf-blades mostly 
oblong or ovate-oblong, 0.7-2.5 cm. wide. 24, A. pumila. 
Fruit biturbinate, the lobes compressed above; leaf-blades 
Jance-elliptic or lanceolate, 0.4—-1 cm. wide. 25. A. Carletoni. 
VI. TURBINATAE 
Bracts 6-12 mm. long, lanceolate or lance-linear, very acute or attenuate; 
perianth purplish-red; blades of the leaves usually much longer than broad. 26. A. angustifolia. 
Bracts 5-7 mm. long, obtuse to very acute; perianth white within, reddish 
outside; blades of the lower leaves mostly as broad as long. 
Fruit deeply lobed, the lobes compressed and acute; bracts linear-lanceolate 
or lance-oblong, very acute or attenuate. 27. A. turbinata. 
Fruit shallowly lobed, the lobes with obtuse edges; bracts ovate or oval, 
obtuse or acutish. 28. A. exalata. 
I. Latifoliae. Prostrate perennials of seashores, with thick fleshy roots. Leaf-blades 
mostly orbicular. Bracts ovate or oval. small. Perianth yellow. Fruit thick-coriaceous, 
deeply lobed, the lobes winglike. 
1. Abronia latifolia Eschsch. Mém. Acad. St.-Pétersb. 5: 271. 1826. 
Abronia arenaria Menzies; Hook. Exot. Fl. pl. 193. 1827. 
Tricratus arenarius Spreng. Syst. Cur. Post. 53. 1827, 
Perennial, from an elongate fleshy root, this 2-10 cm. in diameter and often 30 cm. long 
or longer; stems very stout, 3-10 dm. long, sparingly branched, prostrate, densely glandular- 
puberulent, the internodes mostly longer than the leaves; petioles stout, 1-6 em. long, viscid- 
puberulent; leaf-blades orbicular to oval, rounded-deltoid, or reniform, 1.5-4 em. long, 1-4 
cm. wide, obtuse to subcordate at the base, sometimes short-decurrent, broadly rounded at 
the apex, thick and succulent, sparsely or densely and minutely viscid-puberulent, or some- 
times glabrate; peduncles stout or slender, 2-10 em. long, viscid-puberulent or viscid-villous; 
bracts 5, broadly ovate or ovate-oval, 5-7 mm. long, 3-4 mm. wide, obtuse or acute, scarious, 
viscid-puberulent or short-villous; flowers numerous, the perianth 13-15 mm. long, the tube 
slender, short-villous or viscid-puberulent, greenish-yellow, the limb 5-8 mm. broad, yellow; 
fruit biturbinate, 8-15 mm. long, deeply 5-lobed, coriaceous, puberulent, 1-costate in the angles, 
