514 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. , 
Corolla lobes convolute; capsules elastically dehiscent. 
128. ACANTHACEAE (p. 597). 
Placentz of the ovary parietal. 
Plants parasitic; leaves scalelike, without green coloring matter. 
130. OROBANCHACEAE (p. 599). 
Plants not parasitic; leaves green. 
Ovary and capsule 2-celled; shrubs; seeds winged. 
131. BIGNONIACEAE (p. 600). 
Ovary and capsule 1-celled; herbs; seeds wingless. 
132. MARTYNIACEAE (p. 601). 
116. DICHONDRACEAE. Dichondra Family. 
1. DICHONDRA Forst. 
Annual or perennial creeping herbs with small petiolate entire leaves having orbicu- 
lar or reniform blades, the inconspicuous solitary flowers on short peduncles; calyx 
of 5 distinct or nearly distinct sepals; corolla about 5 mm, in diameter, rotate or cam- 
panulate, 5-lobed; stamens 5, shorter than the corolla; pistil of 2 carpels; styles 2, 
distinct; capsules 2-celled, the carpels more or less united, indehiscent; seeds soli- 
tary, smooth. 
KEY TO THE SPECIES. 
Leaves silvery, densely sericeous........-............-.2200e00ee 1. D. argentea. 
Leaves green, sparingly villous...........-...-...---22-00e-2--0- 2. D. brachypoda. 
1. Dichondra argentea Willd. Hort. Berol. pl. 81, 1816. 
Type Locauiry: ‘‘ Habitat in America meridionali.’’ 
RanGe: Western Texas to Arizona and southward. 
New Mexico: Organ Mountains. Shaded slopes, in the Upper Sonoran and Transi- 
tion zones. 
2. Dichondra brachypoda Woot. & Standl. Contr. U. 8. Nat. Herb. 16: 160. 1913. 
Type Locauity: Filmore Canyon in the Organ Mountains, New Mexico. Type col- 
lected by Wooton and Standley, September 23, 1906. 
Rance: Western Texas and southern New Mexico. 
New Mexico: Kingston; Organ Mountains; Queen. Canyons and in woods. 
117. CUSCUTACEAE. Dodder Family. 
1. CUSCUTA L. DoppeEr. 
Herbaceous parasites with twining yellow or orange stems, the leaves reduced to 
minute scales; flowers perfect, waxy white, cymose; calyx of 5 or 4 imbricated lobes, 
accompanied by as many alternating, crenulate or appendaged scales, or these obso- 
lete; stamens 5 or 4, attached to the corolla in the throat or near the sinuses above the 
scales; ovary 2-celled; styles 2, mostly distinct; stigmas capitate or elongated; cap- 
sules subglobose, depressed or elongated, circumscissile or indehiscent, 1 to 4-seeded. 
It is said that the Navahos used the parched seeds of dodder as food. 
KEY TO THE SPECIES. 
Calyx of 5 almost distinct overlapping sepals, subtended by bracts. 1. C. squamata. 
Calyx gamosepalous, bractless. 
Styles equal, with elongated stigmas.................-....-... 4. C. epithymum. 
Styles unequal, with capitate stigmas. 
Petals acute; styles longer than the capsule.............- 2. C. umbellata. 
Petals obtuse; styles shorter than the capsule............. 3. C. curta. 
