174 NYCTAGINACEAE (FOUR o'CLOCK FAMILY) 



4. Allionia glandulifera A. Nels. Bot. Gaz. 34: 364. 1902. Erect, simple 

 or branched perennial; stems minutely striate, white, glabrous and shimng 

 below, greener upward, 3-5 dm. high: leaves linear to lanceolate, glabrous or 

 the uppermost viscid-pubescent: inflorescence a freely branched cyme, nearly 

 naked, usually densely viscid or glandular-pubescent: involucre about 1 cm. 

 broad, with elliptic-ovate subacute bracts: calyx white or pinkish, broadly 

 funnelform, 7-10 mm. long; its limb deepljf 4-lobed, each lobe bifid, giving 

 8 subequal obtuse elliptic segments: fruits ribbed and pubescent. — ^Through- 

 out the central Rocky Mountains. 



5. AUionia diffusa Heller, Minn. Bot. Stud. 2: 33. 1898. Branched from 

 the base and diffusely spreading: stems whitened and glabrous below, the 

 middle part often marked with hairy lines, the inflorescence glandular- 

 pubescent: leaves lanceolate to linear: involucres in close terminal cymes, with 

 triangular-lanceolate lobes: calyx rose-color, its lobes broadly obovate. — 

 Said to occur from N. Dakota to Kansas and Arizona. 



6. Allionia linearis Pursh, Fl. Am. Sept. 2: 728. 1814. Glabrous except 

 for a glandular-puberulence above; stems slender, erect, 3-6 dm. high: leaves 

 linear, thick, 3-9 cm. long: involucral lobes broadly ovate, obtuse: calyx 

 campanulate, purple, with ovate lobes: stamens and style exserted as is also 

 the case in the two preceding species: fruit oblong-ovoid, ribbed and tuber- 

 culate, pubescent. Oxybaphus angustif alius. (A. divaricata Rydb. 1. c.) — 

 From the base of the Rocky Moimtains eastward into the plains and south 

 to Texas. 



6a. Allionia linearis Bodinii (Holz.) A. Nels. A low form with reduced 

 inflorescence, the lower involucres often soUtary in the axils. Oxybaphus 

 Bodinii Holz. Contrib. U. S. Nat. Herb. 1: 287. 1893.— From Wyoming to 

 New Mexico. 



7. Allionia lanceolata Rydb. 1. c. 691. 1902. A branched perennial; 

 stems erect or ascending, glabrous below, viscid-pubescent with short hairs, 

 4-15 dm. high: lower leaves short-petioled, the upper sessile; blades lanceolate 

 or ovate-lanceolate to almost linear, 3-10 cm. long, very thick, obtuse or 

 blunt at the apex: involucres numerous, in terminal cymes, 1-1.5 cm. wide, 

 lobes rovmded-ovate, sometimes acutish: perianth pink, about 10 mm. broad; 

 fruit obovoid, 4.5-5 mm. long, with usually 4-5 broad ribs and finely tuber- 

 culate faces. {A. sessilifolia Osterh. Bull. Torr. Bot. Club 32: 611. 1905.) 

 — ^Minnesota to Colorado and Texas. 



3. WEDELIA Loefr. 



Annual or perennial herbs, with opposite very imequal leaves, and axillary 

 pedunculate flowers. Perianth with an oblique 4- or 5-lobed limb. Fruit 

 ovate, compressed, smooth and convex on the inner side. 



1. Wedelia incarnata (L.) Kuntze, Rev. Gen. PI. 533. 1892. Stems slen- 

 der, branching, prostrate; pubescence viscid, short or floccose: leaves ovate: 

 lobes of the involucre concave: calyx rose-colored or white: fruit with a 

 double line of tubercles on the back, surrounded by a rigid winged margin, 

 toothed and inflexed: stamens 3. Allionia incarwoto.— Southern Colorado 

 to Texas and California. 



4. ABRONIA Juss. 



Often prostrate, and usually more or less viscid-pubescent, with thick op- 

 posite unequal leaves, and elongated axillary and terminal peduncles; flowers 

 usually very fragrant and showy. Tube of the perianth elongated, and the 

 limb of 5 (or 4) obcordate or emarginate segments. Stamens unequal ad- 

 nate to the tube. Fruit coriaceous or indurated, 1-5- winged, mostly retic- 

 ulately veined, inclosing a smooth cyUndrical achene. — (Includes Tripterocalyi 

 Hook.) , 



