o2 Contributions to Western Botany. | 
red; flowers in ours tubular-bell-shaped. Arizona and New 
Mexico. 
4. A.linearifolia (Wats. Proc. A. A.17 376). Slender plants, 
2° high, with spreading branches from the alternate axils, glab- 
rous except the pubescent peduncles, involucres and flowers; 
leaves linear, narrowed at base, the lower 3-4’ long; peduncles 
very slender, spreading or reflexed, 2-4’ long; involucres 1-2-_ 
flowered, becoming 6” wide, cleft to below the middle, the lobes 
acute to acuminate; flowers greenish, bell-shaped, 2-3” long; — 
stamens 5; fruit oblong-obovate, pubescent, very prominently 5-_ 
ribbed, the ribs thick and almost touching. Resembling some 
forms of A. nyctaginea. Valleys of southern Arizona in the 
Tropical Zone. 
A. diffusa Heller Minn. Bot. Stud. 2 33. Upper part of 
plant glandular, plants diffuse; leaves lanceolate-linear, some- 
what narrowed below; 24-4’ long, all acute, grayish on margin; 
long 
long, lobes broadly obovate; stamens 3, exserted. This appears 
to be a 3.stamened form of A. linearifolia. Gravelly hills,Santa — 
Fe, New Mexico. a 
2A. Neither with glaucous stems nor linear leaves. 
2AB. Fruit smooth, involucres 1-5 flowered. 
2ABC. Flowers solitary; plants of southern Utah and north- 
ern Arizona. " 
5. A. glaber (Wats:) Kuntze Am. Nat.7 6. Smooth, pan- 
icles large and open; flowers solitary in the involucre, en slender 
pedicels 2-3” long, shorter than the involucre; fruit oblong, 
strongly tuberculated between the prominent ribs. Southern 
Utah to Texas. 
2AB2C. Flowers not solitary: plants of the Mexican Boundary 
region and Texas. 
2AB2CD. Plants glabrous, except the peduncles in A. aggre- 
gata. 

