256 NYCTAGINACEAE 



Wings completely encircling the fruit. 2. Tripterocalyx . 



Bracts inconspicuous or lacking. 3. Selixocarpus. 



Fruit globular, neither crested nor winged ; bracts attached each to a pedicel of the 



umbel-like or corymbose inflorescence; perianth funnelform. 4. Hermidium. 

 Bracts united. 



Fruit neither strongly tubercled nor winged. ' 



Fruit not ribbed; involucre herbaceous, little if at all enlarging in fruit, not be- 



conaing membranous. 

 Stamens usually 5; involucre campanulate, not enlarged in fruit. 



Flowers several in each involucre. 5. Quamoclidiox. 



Flowers solitary in each involucre. 6. Hesperonia. 



Stamens 3; involucre rotate, somewhat enlarged in fruit in the manner of the 

 next genus, but not membranous. 7. Allioniell.\. 



Fruit ribbed; involucre rotate, in fruit becoming much enlarged and membranous. 



8- Allionia. 

 Fruit with two rows of strong tubercles on the back and surrounded by two-toothed 

 inflexed wings. 9. AVedeliella. 



1. ABRONIA Juss. Sand VerbenAj Sand Puffs. 



Annual or perennial herbs, with opposite petioled leaves. Leaf-blades entire 

 and^ oblique at the base. Flowers several in heads, surrounded by five or more 

 distinct bracts. Perianth colored and corolla-like, salver-shaped, with an elongated 

 tube, and expanding above into a 5-lobed hmb. Stamens 3-5, included. Fruit 

 leathery, 3-5-winged, or 3-5-ribbed. Seed filling the pericarp and adherent to it. 



Fruit biturbinate, i. e., tapering at both ends, irre^Iarly ridged or crested. 

 Flowers about 2 cm. long; limb 5-10 mm. wide. 



Bracts broadly obovate, over 1 cm. long. 1. A. fragrans. 



Bracts ovate-lanceolate, less than 1 cm. long. 2. A. nudata. 



Flowers about i cm. long; limb 3-5 mm. wide; bracts ovate to lanceolate-ovate, 5-8 



mm. long. 



Petioles of the stem-leaves shorter than the very thick blades; plant low, about 1 

 dm. high. 3. a, pufiiila. 



Petioles of the stem-leaves much longer than the moderately thick blades ; plant 

 slender. 2-4 dm. high. 4. A. ammophila. 



Fruit turbmate or obpyramidal. i. e., almost truncate above, distinctly winged, the 



wings very broad above. 



Plant almost acaulescent; stem and leaves greatly surpassed by the long peduncles. 



^, ^ . , , b. A. nana. 



Plant with an elongated stem. 



Bracts broadly ovate or obovate. acute or obtusish. 



Stem distinctly viscid-pubescent; leaves scabrous-puberulent ; bracts 1-1.5 cm. 



long. 



Blades of the stem-leaves elliptic; bracts broadly obovate, 12-15 mm. wide. 



obtusish. 6. A. salsa. 



Blades of the stem-leaves lanceolate; bracts oval, acute, about 6-7 mm. 



J^'^?®- . 7. A.fallax. 



Stem finely puberulent or glabrous; leaves glabrous; bracts 5-8 mm. long. 

 Stem puberulent; leaves long-petioled; bracts 8-15 mm. long. 

 ^^ , ^ , , 8. ^. ellipticQ. 



btera glabrous ; leaves short-petioled; bracts 5 mm. long, 9. A. glabra. 

 Bracts oblong-lanceolate or lanceolate, attenuate or cuspidate. 



Stem glabrous. 10. A. lanceolata. 



Stem more or less pubescent. 



Stem puberulent; wings with double lamina, coriaceous. 



-^, .„ . 11. A. Carletoni. 



Stem villous; wmgs with single lamina, membranous. 12. A. villosa. 



1. A. fragrans Xutt. Perennial; stems several; branches erect, 15-25 dm. 

 high, glabrous below, puberulent and sub viscid above; leaves glabrous or nearly 

 so, petioled; blades oval, ovate, or elliptic, rounded at the apex, 3-6 cm. long; 

 fruit about 8 mm. long, 4 mm. broad, one-third from the apex. Dry soil: S.D- 

 — la.— Kans.— N.:M.— Ida.— Mont. PlainSubmoni. My-Jl. 



. 2.\ •^* nudata Rydb. Perennial; stems very long and decumbent, sparingly 

 hispidulous; leaf-blades broadly lanceolate, thick, glabrous, 2-5 cm. long; flowers 

 many, about 2 cm. long; lunb 5-6 mm. wide; achenes thickest a httle above the 

 middlle, crested, 8-10 mm. long, those of the marginal flowers very obhquely 

 ovoid-fusiform, scarcely at all crested. Barren hills: e Mont. Plain. S. 



3. A. pumila Rydb. Perennial, caespitose; stems ascending, about 1 dm. 

 long, puberulent; leaf-blades 1.5-3 cm. long, thick, minutely puberulent, oval, 

 elhptic or somewhat ovate; fruit bipyramidal, broadest one-third from the apex, 

 merely crested or the mner ones somewhat winged. Canons: Utah. Je-Jl- 



