360 Orobanchaceae 
H. Plant glabrous; stems branching; calyx 2-cleft; corolla purplish, 12 mm. 
long. W. C. I’, parviflora, Sm. 
HH. Plant pubescent or glabrate; stems simple; calyx 5-toothed: corolla 
scarlet, 25—-37 mm. long. U.-C. 
I, densiflora Benth. (Scarlet Lousewort) 
AA. Stem-leaves in whorls or nearly so. W. 
FP. menziesii Benth. 
RHINANTHUS YELLOW-RATTLE 
Annual, erect, 3—6 dm. high (ours). Leaves opposite; in ours lanceolate, 2.55 
cm. long, sessile. Flowers yellow (ours) or blue or variegated, |2—18 mm. long (ours), 
solitary in the upper leaf-axils or in terminal secund leafy-bracted spikes. Calyx flat- 
tened, 4-toothed, much inflated, membranous and veiny in fruit. Corolla very irregular 
or 2-lipped; upper lip compressed, arched, minutely 2-toothed below the entire apex; 
lower lip shorter, 3-lobed, its lobes spreading. Stamens 4, 2 shorter; anthers pilose. 
Capsule orbicular, flat. Seeds several, nearly orbicular, winged. (Gk. rhin—=a snout, 
anthos—a flower; referring to the compressed corolla-wings.) W. C. E. 
R. crus-galli L. 
OROBANCHACEAE Broom-rape Family 
Herbs, erect, low, root-parasites, white or yellow or brown or purple, without green; 
stem simple. Leaves scale-like, alternate, appressed in most. Flowers perfect, irregular, 
either sessile in terminal bracted spikes or racemes, or else solitary and peduncled in the 
axils of the scales. Calyx either 4—-5-toothed to -parted, or else deeply split on | or 2 
sides and the lobes entire or toothed. Corolla sympetalous, somewhat oblique, 2-lipped, 
5-lobed. Stamens 4, 2 shorter, on the corolla-tube, alternate with corolla-lobes; rudiment 
of 5th stamen sometimes present; filaments slender. Ovary-superior, 1-celled; placentae 
4, parietal, sometimes nearer each other in pairs; style slender, stigma disk-like, 2- or 
4-lobed. Capsule 2-valved. Seeds many, reticulate or wrinkled or striate. 
A. Plant glandular-pubescent; scale-leaves often scattered; inflorescence often not 
cone-like; upper lip of corolla 2-lobed; anther-sacs separate below, their bases mu- 
cronate. 
B. Peduncles 2.5—20 cm. long, naked. THALESIA (p. 360) 
BB. Peduncles 0—2 cm. long, often with bracteoles at base of calyx or farther down. 
; OROBANCHE (p. 361) 
AA. Plant glabrous; scale-leaves densely crowded: inflorescence cone-like; upper lip 
of corolla entire; anther-sacs closely parallel, their bases blunt. BOSCHNIKIA (p .361) 
THALESIA (Aphyllon) CANCER-ROOT 
Glandular or viscid-pubescent. Leaves scattered. Flowers white or violet or yel- 
lowish, on long bractless scape-like peduncles. Calyx campanulate or hemispheric, nearly 
equally 5-cleft; lobes acute or acuminate. Corolla long, curved, slightly 2-lipped; upper 
lip 2-lobed; lower lip 3-lobed:; all 5 lobes nearly equal. Stamens included; anther-sacs 
mucronate at base. Ovary ovoid; style deciduous. (Honor of the Greek philosopher 
Thales. ) 
A. Flowers 1—4; calyx-lobes subulate, acuminate, longer than the tube. W. C. E. 
(T. purpurea; T. sidi.) T. uniflora Brit. 
AA. Flowers 3—20; calyx-lobes triangular, acute, shorter than the tube. W. C. E. 
T. fasciculata Brit. 

