Bulletin University of New Mexico—No. 49 
Involucre calyz-like, of united bractlets, 1 to 12 
‘ flowered. 
Involucre 5-lobed, sain in fruits, 1 to 5 flow- 
ered - - - (1) aLtionta. 
Involucre deeply 3 ated: 3. pith) not enlarged 
in fruit, - - - (2) WEDELIA. 
Involucre of 5 or more ane bracts, under a many- 
flowreed head, - - (3) ABRONIA. 
Involucre minute, 3 purplish bracts to each flower, 
- - - - (4) BOERHAVIA. 
1. Attionta, Loefl. 
Herbs with very large thick perennial roots, opposite 
leaves, calyx with a very short tube and bell-shaped 
(rose or purple) deciduous limb which is plaited in the 
bud, usually 3 stamens, filiform style and fruit usual- 
ly several-ribbed or angled. 
Fruit glabrous, involucre 3-flowered, 4. OXYBAPHOIDES. 
Fruit rein involucre 3 to 5-flowered, 
- - : A. ANGUSTIFOLIA. 
A. OxYBAPHOIDEs, (Gray.) K wntze. Stems slender, 
duffuse, procumbent; leaves all deeply cordate on 
rather long petioles, the lowest reniform, the upper 
acuminate and sometimes subangulate; involucre and 
peduncles very viscid. Tijeras Canon. 
A. aneustirotia, Nutt. Often tall, glabrous 
execept the more or less hirsute peduncles and involu- 
eres; leaves linear thick and glabrous, often elongated, 
2 to 6 in. long. 
2. Wenpetria, Loe/l. 
Annual or perennial herbs, with opposite very un- 
equal leaves; flowers on peduncles in the axils., usual- 
ly three stamens; the ovate compressed fruit surround- 
ed by a rigid winged margin, smooth and convx on the 
inner side and with a double line of tubercles on the 
back. 
W. mncarnata, L, Kuntze. Stems slender, branch- 
ing, prostrate; pubescence viscid, short or woolly 
leaves ovate; lobes of involucre concave, acute. Com- 
mon on the sandier parts of the mesa. 
3. ABRONIA, Juss. 
Low, usually viscid plants, with thick petioled un- 
equal leaves, peduncles bearing numerous showy 
and sessile flowers in a solitary head: salver- 
form calyx with limb of 5 segments, 5 unequal and in- 
cluded stamens adnate to the tube, and a coriaceous 
(81) 
