4 2 
~ 7 al ae 
329 THE BROOMRAPE FAMILY. torebanee: 
It varies according to station, and the plant it affects. Many of these 
varieties are considered as species, and three are commonly admitted 
into the British Flora :—O. picridis, F. Schultz, a tall, very pale- 
coloured variety, growing on Picris hieracioides ; O. amethystea, Thuill., 
assuming a bluer tint than any of the others, and growing on Lryngium ; 
O. Hedere,; Duby, not uncommon on J/vy in the south of England and 
Ireland, as on the Continent ; it is said to differ from the common 
form in the yellow, not purple, stigma, and other trifling characters, 
which, however, do not appear to be constant. 
6. O. ceerulea, Vill. (fig. 728). Blue B.—Stem simple or rarely 
branched, 6 to 9 inches high, with a light bluish tint. Flowers of a 
deep purplish- -blue, with 2 small bracts at its base, 1 on each side, ~ 
besides the larger bract common to all Orobanches. Calyx usually 
closed at the back by a fifth tooth or lobe, much shorter and broader 
than the others. Corolla-lobe rather long and curved ; the 5 lobes, 
although arranged in 2 lips, are less unequal, and less wavy than in 
the preceding species. 
Chiefly, if not exclusively, on Achillea Millefolium ; not uncommon on 
the continent of Europe, and in west-central Asia. In Britain, only in 
grassy pastures near the sea, in the eastern and southern counties, and 
in the Channel Islands. Fl. carly summer. The O. arenaria, Borkh., a 
larger plant, of a paler blue, with hairy anthers, parasitical on Artemisias 
in light, sandy soils, has been found in Alderney. 
7. O. ramosa, Linn. (fig. 724). Branched B.—Very much smaller 
than O. cerulea, of a pale straw-colour, with smaller pale-blue flowers. 
Stem often branched, seldom above 6 inches high. Flowers shaped 
like those of O. cerulea, and, like them, they have 2 small lateral 
bracts besides the larger one; but the calyx is split at the back, and 
has only 4 lobes, as in the brown Orobanches. 
On Hemp, Lucern, and some other crops, chiefly in southern Europe, 
and has been found, though very rarely, in some of the southern and 
eastern counties of England. Fl. summer. 
Il], LATHRAAA. TOOTHWORT. 
A small genus closely allied to Orobanche, but the flowers are less 
irregular, the calyx broadly campanulate or inflated, with 4 short, broad, 
erect lobes, the upper lobe of the corolla forming a more or less distinct 
upper lip, and the 4 placentas to which the seeds are attached in the 
capsule are more fleshy, and more distinctly united in pairs. 
1. L. squamaria, Linn. (fig. 725). Common 7.—A pale rose-coloured 
plant, with flesh-coloured or slightly bluish flowers, streaked with purple 
or dark red. Rootstock fleshy and creeping, covered with close-set, 
short, thick, fleshy scales. Flowering stems erect, from 38 or 4 inches 
to near a foot high, with a few broad, orbicular, much less fleshy scales, 
passing gradually into the bracts. Flowers numerous and nodding, in 
a dense spike, or sometimes shortly stalked. Calyx about 5 lines long. 
Corolla half as long again, the upper lip entire or slightly notched. 
Stamens and style nearly as long as the corolla, or sometimes, especially 
the style, projecting beyond it. . 
On the roots of trees, especially the Havel, throughout Europe and d 
