Part 3, 1918] ALLIONIACEAE 205 
Plants annual. 
Flowers not racemose. 
Branches of the inflorescence glandular-villous; bracts large, as 
long as the fruit, persistent. 10. B. purpurascens. 
Branches of the inflorescence puberulent or glabrous; bracts 
ba minute, much shorter than the fruit, often deciduous. 
Fruit winged, the broad or narrow wing sharply differentiated 
from the body. 
Fruit 4-winged, abruptly contracted into a short winged 
stipe. — 1l. B. pterocarpa. 
Fruit 5-winged, not stipitate. 
Perianth about 1 mm. long; fruit nearly twice as long 
as broad; flowers short-pedicellate. 12. B. megaptera. 
Perianth 3 mm. long; fruit nearly as broad as long; 
flowers long-pedicellate. 13. B. alata. 
Fruit not winged, the angles sometimes thin but evidently con- 
tinuous with the body of the fruit. 
Fruit 3- or 4-angled. 14, B. triquetra. 
Fruit 5-angled. 
Fruit 3-4 mm. long. 
Perianth about 3 mm. long; fruit 2-2.5 mm. broad, 
the angles thin, strongly compressed. 15. B. maculata. 
Perianth less than 2 mm. long; fruit 1.5 mm. broad or 
less, the angles thick. 16. B. evecia. 
Fruit 2.2-2.7 mm. long. 
Flowers in few-flowered simple umbels. 17. B. intermedia. 
Flowers mostly in dense headlike cymes or in com- 
pound umbels. 18. B. lateriflora. 
Flowers racemose. 
Fruit 4-angulate; bracts persistent, equaling the fruit. 19. B. Wrightii. 
Fruit 5-angulate; bracts deciduous, small. 
Fruit truncate at the apex. 20. B. Rosei. 
Fruit rounded at the apex. 
Ribs of the fruit broad, obtuse, almost touching each other, 
the sulci very narrowly linear, smooth. 
Perianth 3 mm. long; leaf-blades lanceolate, brown- 
punctate beneath. 21. B. alamosana. 
Perianth 1-1.5 mm. long; leaf-blades mostly oval or 
oblong, epunctate. 22. B. Coulteri. 
Ribs of the fruit narrow, acute, the sulci broad and open, 
transverse-rugulose. 
Perianth 2.5-3 mm. long; stamens exserted. 23. B. Xanti. 
Perianth 1—1.5 mm. long; stamens included. 
Racemes remotely flowered; bracts lanceolate, 
shorter than the ovary at anthesis; stems slightly 
viscid-puberulent below. 24. B. Torreyana. 
Racemes densely flowered; bracts orbicular-ovate, 
usually much longer than the ovary; stems very 
viscid, especially below. 25. B. spicata, 
1. Boerhaavia coccinea Mill. Gard. Dict. ed. 8. Boerhaavia no. 4. 
1768. 
Boerhaavia diffusa Sw. Obs. Bot. 10. 1791. Not B. diffusa L. 1753. 
Boerhaavia paniculata Rich. Act. Soc. Hist. Nat. Par. 1: 105. 1792. 
Boerhaavia adscendens Willd. Sp. Pl. 1: 19. 1797. 
Boerhaavia decumbens Vahl, Enum. Pl. 1: 284. 1804. 
Boerhaavia laxa Pers. Syn. Pl. 1: 36. 1805. 
Boerhaavia diffusa paniculata Kuntze, Rev. Gen. 533. 1891. 
Boerhaavia coccinea parcehiysuta Heimerl, Symb. Ant. 7: 212. 1912. 
Perennial, from a stout or slender, often fusiform, somewhat fleshy root; stems few or 
numerous, ascending or procumbent, 2-10 dm. long, sparsely branched, minutely puberulent 
elow or sometimes sparsely villous, especially at the nodes, glabrous above, brownish; petioles 
slender, 0.3-3 cm. long, usually sparsely villous; leaf-blades rhombic-orbicular, broadly rhom- 
bic-ovate, oval, or oval-oblong, 2-5.5 cm. long, 1.5-5 cm. wide, subcordate to broadly rounded 
at the base, broadly rounded to obtuse or rarely acute at the apex, entire or usually subsinuate, 
bright-green above, pale beneath, epunctate, glabrous or obscurely puberulent, villous-ciliate, 
rarely villous beneath along the veins; inflorescence of ample, naked, lax, terminal or axillary 
cymes, much branched, the branches slender, ascending or divergent, glabrous, the flowers 
subsessile in glomerules of 2-4 on the ends of filiform peduncles 3-10 mm. long, the bracts 
minute, lanceolate or ovate, deciduous; perianth reddish-green, 2 mm. broad, minutely glandu- 
lar-puberuJent; stamens 2, short-exserted; fruit narrowly obovoid, 3-4 mm, long, rounded at 
