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24 KEY AND FLORA 
im) 
thus forming a spike. Calyx irregularly 4-5-cleft, split down 
the lower side. Corolla swollen below, decidedly 2-lipped, the 
upper lip arched. Stamens projecting. 
1. C. americana Wally. Squawroort, Cancer Roor. Stems 3-6 
in. high, yellowish or yellowish-brown. Flowers 1umerous, incon- 
spicnous. Corolla dirty white or pale brown, In oak woods; not very 
common. 
II. OROBANCHE L. (THALESIA) < 
Brownish or whitish plants, with naked scapes borne on 
scaly, mostly underground, stems. Calyx regular, 5-cleft. 
Corolla 5-lobed, slightly irregular. Stamens not projecting 
from the corolla tube. 
1. 0. uniflora L. Onr-FLowrrep Cancer Roor. Slightly cov- 
ered with clammy down. Stems very short-branched, each with 1-3 
1-flowered scapes 3-5 in. high. Calyx lobes lance-awl-shaped, half 
as long as the corolla. Corolla yellowish-white, veiny, purple-tinged ; 
palate with 2 yellow bearded ridges. Damp woods. 
2. O. fasciculata Nutt. Stem scaly, upright, 3-4 in. high above 
ground and generally longer than the numerous 1-flowered peduncles. 
Calyx lobes short, triangular. Parasitic on wild species of Artemisia, 
ete., in sandy and loamy soil N.W. and W. 
93. ACANTHACER. Acantuvus FAaMILy 
Herbs or shrubs. Leaves opposite or whorled, without 
stipules. Flowers zygomorphiec, usually with large bracts. 
Calyx of 4 or 5 unequal segments which considerably over- 
lap each other. Corolla 4-5-parted and usually more or less 
2-lipped. Stamens usually 2 long and 2 short, sometimes only 
2. Ovary free from the calyx. Fruit usually a capsule. Seeds 
not winged. A large family, mostly tropical, with only a few 
insignificant wild species in the northern United States. 
I. DIANTHERA L. 
Perennial herbs ; stem smooth. Leaves opposite, entire or 
toothed. Flowers axillary, solitary or clustered, zygomorphie. 
Calyx 5-parted. Corolla 2-lipped; upper lip erect, concave, 
entire or notched; the lower prominently veined, spreading, 
