Part 3, 1918] ALLIONIACEAE 199 
the branches stout; petioles stout, 3 mm. long or shorter, most of the blades sessile; leaf-blades 
lance-oblong to lanceolate, the lowest rarely ovate-oblong or ovate-oval, 1~2.8 cm. long, 3-11 
mm. wide, cuneate or obtuse at the base, gradually narrowed to the acute to attenuate or 
rarely obtuse apex, very thick and succulent, flat; flowers numerous, subsessile, the bracts 
subulate, 3 mm. long or shorter; perianth 3-4 em. long, the tube slender, 1 mm. in diameter, 
the limb about 1 cm. broad, pale greenish-yellow; stamens 5; fruit 6-7 mm. long, the wings 
2-3 mm. broad, glabrate, the body finely costate, truncate at both ends ; seed narrowly oblong, 
4 mmm. long, pale-brown. 
TYPE Locality: On white soil just south of the White Sands, New Mexico. 
Distriurion: In dry, strongly alkaline soil, southern New Mexico and western Texas. 
5. Selinocarpus Palmeri Hemsl. Biol. Centr. Am. Bot. 3: 6. 1882. 
Low shrub, obscurely glandular-puberulent on the younger parts but soon glabrate, 
much branched, the branches stout, ascending; leaves sessile, probably terete, but flat and 
linear when dry, 1-4 cm. long, 1-1.3 mm. wide, apiculate; flowers few, axillary and terminal, 
subsessile, the bracts linear-subulate, 2-3 mm. long, long-attenuate; perianth 3.5 cm. long, 
obscurely glandular-puberulent, the tube very slender, dilated above into a limb 1.5 cm. 
broad; stamens exserted about | cm.; fruit 5-winged, or by abortion 2- or 3-winged, the wings 
4-5 mm. broad. 
TYPE LocaLity: San Lorenzo de Laguna, Coahuila. 
DISTRIBUTION: Known only from the type locality. 
ILLUSTRATION: Hemisl. Biol. Centr. Am. Bot. pl. 70. 
6. Selinocarpus Purpusianus Heimerl, Oesterr. Bot. Zeits. 63: 353. 
1913. 
Low shrub, 1-2 dm. high, densely branched, the branches divaricate or widely ascending, 
stout, grayish, densely puberulent and glandular-hirtellous, or glabrate below, the internodes 
5-20 mm. long; leaves sessile, the blades narrowly oblong or spatulate-oblong, 4-11 mm. long, 
1.5-2 mm. wide, obtuse or rounded at the apex, thick and succulent, densely glandular-hirtel- 
lous; flowers few, subsessile, the 2 bracts linear-subulate, 3.5 mm. long; perianth 2.5-3 em. 
long, densely glandular-hirtellous outside, the tube very slender; stamens 6; fruit (immature) 
6 mm. long, densely puberulent and hirtellous. 
Tyre Locality: Sierra del Rey, Coahuila. . 
DISTRIBUTION: Known only from the type locality. 
13. WEDELIELLA Cockerell, Torreya 9: 167. 1909. 
Wedelia Loefl. (Iter Hisp. 180, hyponym. 1758) Reise 240. 1766. Not Wedelia Jacq. 1760. 
Prostrate annual or perennial herbs, with dichotomous branches, pubescent. Leaves 
opposite, those of a pair very unequal, petiolate, the blades broad, entire or sinuate. Flowers 
perfect, in axillary pedunculate clusters of 3, each subtended by a broad green bract, the bracts 
subequal, slightly united at the base, cticullate, enclosing the fruit; perianth corolla-like, 
purplish-red or white, short-funnelform, the tube constricted above the ovary, the limb oblique, 
4- or 5-lobed, induplicate-plicate. Stamens 4-7, hypogynous; filaments unequal, capillary, 
exserted; anthers didymous. Ovary ovoid; style capillary; stigma capitate, papillose. Antho- 
carp coriaceous, obovoid or oval, strongly compressed, 3-costate or cristate on the inner surface, 
the outer surface bearing 2 parallel longitudinal rows of stipitate glands, the thin margins 
dentate or entire, inflexed. Seed with the thin testa adherent to the pericarp; embryo uncinate, 
the broad cotyledons enclosing the farinaceous endosperm; radicle slender, elongate, descending, 
Type species, Allionia incarnaia L. 
Fruit with a broad entire crest on the inner side. 1. W. cristata. 
Fruit not cristate on the inner side. ; . 
Involucres very viscid; margins of the fruit usually with few broad teeth, 
rarely entire; plants perennial. onan 
eee not viscid; margins of the fruit with numerous slender teeth; plants 
annual. 
2. W. incarnate. 
3. W. glabra. 
