ALLIONIACEAE 407 



5. AUionia lanceolkta Rydb. Foliage glabrous or nearly so to the inflorescence. 

 Stems erect or ascending, 4-17 dm. tall, simjile or sparingly branched above, or through- 

 out, sometime^ finely pubescent on the sides : leaf-blades lanceolate to linear-lanceolate, or 

 rarely oblong to oblong-obovate, 3-15 cm. long, thick, obtuse or blunt, even the narrow 

 and more or less acuminate ones with blunt tips, slightly undulate or crisped, ciliolate, 

 essentially sessile : involucres in terminal cymes, 1-1.5 cm. wide ; lobes rounded or acut- 

 ish : calyx pink, about 10 mm. broad : fruit obovoid, 4.5-5 mm. long, with usually 4 

 broad ribs and finely tubercled faces. 



On plains and prairies and in dry sandy soil, Minnesota to Tennessee, South Carolina, Alabama, 

 Texas and Colorado. Summer and fall. 



6. Allionia dlbida Walt. Foliage glabrous, except the viscid-pubescent inflorescence 

 and upper part of the stem. Stems 2-12 dm. tall, 4-angled below, enlarged at the nodes: 

 leaf-blades lanceolate to oblong-lanceolate or oblong, 3-12 cm. long, thin, acute or acumi- 

 nate at the apex, attenuate to the petiole-like base, nearly sessile : involucres becoming 2 cm. 

 broad ; lobes triangular, about as long as the tube: caly.x pubescent, white; lobes ovate, 

 shorter than the tube : stamens and style exserted : fruit obovoid, 5 mm. long, with tufts 

 of silvery hairs, the angles crested, the faces tuberculate. [ Oxijbaphus albulas ( Walt. ) Cliois. ] 



In dry soil, South Carolina and Georgia. Spring and summer. 



7. Allionia pilosa (Nutt. ) Rydb. Foliage finely hirsute. Stems erect or somewhat 

 spreading, 3-12 dm. tall, sometimes sparingly branched, more or less hirsute as well as 

 viscid : leaf-blades oblong-ovate to lanceolate or narrowly lanceolate, 2-9 cm. long, some- 

 times slightly acuminate but blunt, thick, often slightly crisped, cuneately narrowed at the 

 base, essentially sessile: involucres in terminal cymes, 1.5-2 cm. broad; lobes acute or 

 acutish : calyx about 10 mm. broad: fruit narrowly obovoid, 4.5-5.5 mm. long, with 

 usually 5 slender ridges and transversely rugose-tuberculate faces. 



In dry or sandy soil, Wisconsin to South Dakota, Louisiana and Texas. Summer and fall. 



8. Allionia comata Small. Foliage hirsute or hirsute-pilose. Stems 3-6 dm. tall, 

 angled, the hairs viscid, somewhat tangled : leaf-blades thick, ovate or broadly ovate, 2-5 

 cm. long, usually rounded at both ends or cordate at the base, undulate; petioles shorter 

 than the blades: inflorescence viscid: involucres becoming fully 1 cm. broad, copiously 

 pubescent : calyx glabrous or nearly so, pale red, about 2 cm. broad ; lobes shorter than the 

 tube: stamens and style exserted: fruit slightly broadened upward, minutely pubescent. 



In dry soil, Nebraska to Texas and New Mexico. Summer. 



9. Allionia oblongifolia (A. Gray) Small. Foliage glabrous or neariy so. Stems 

 erect, or ascending, 8-12 dm. tall, with elongated ascending branches : leaf-blades ovate- 

 lanceolate to broadly lanceolate, 3-7 cm. long, acute, more or less crisped, glabrous or 

 nearly so, cuneately or abruptly narrowed into the relatively slender petioles : involucres 

 in open paniculate cymes, terminating slender peduncles 5-7 mm. long, relatively small, 

 less than 1 cm. broad ; lobes ovate or orbicular-ovate, obtuse or acutish : calyx white. [ Ojy- 

 baphus nyctcujineus y oblongifolius A. Gray.] 



In river valleys, southern Texas. Summer. 



10. Allionia floribiiada ( Chois. ) Rydb. Foliage glabrous below. Stems 3-9 

 dm. tall, stoutish, swollen at the nodes : leaf-blades ovate to lanceolate, 2-5 cm. long, 

 obtuse, acute or acuminate, entire, rounded or acutish at the base, short-petioled : inflor- 

 escence pubescent: involucres finally more tlian 1.5 cm. broad, glabrate ; lobes triangular, 

 longer than the tube : calyx pubescent without, usually white : fruit obovoid, constricted 

 near the base, 4 mm. long; minutely pubescent, with stout prominent crested ridges. 



In dry soil, Nebraska to Texas and New Mexico. Summer. 



11. Allionia nyctaginea Michx. Foliage glabrous or minutelv' pubescent. Stems 

 3-10 dm. tall, stoutish, forking : leaf-blades triangular-ovate, 2-10 cm. long, acute or acumi- 

 nate, erose, obtuse or cordate at the base ; petioles 1-2 cm. long : inflorescence pubescent : 

 involucres campanulate, 1.5 cm. broad, pubescent ; lobes ovate to triangular, shorter than 

 the tube : calyx red, hairy without ; lobes oblong to ovate, shorter than the tube : stamens 

 3-5, exserted : fruit linear-oblong to oblong-ovate, 4 mm. long, pubescent, sharply but 

 .shallowly ridged, the faces minutely tuberculate. 



In dry soil, Northwest Territory to Wisconsin, Louisiana and New Mexico. Spring and summer. 



3. WEDELIA Loefl. 



Annual or perennial depressed pubescent herbs, with forking stems. Leaves opposite : 



blades unequal in size, inequilateral, entire, petioled. Flowers white or pink, 3 in each 



involucre. Involucres calyx-like, solitary in the axils, peduncled, the bracts unequal. 



Calyx membranous : tube oblique, constricted above the ovary : limb expanded, unequally 



