Vallerianelia.| XLI. VALERIANE. 219 
border of the calyx. On being cut across, it shows 1 small cell occu- 
pied by the seed, and 2 somewhat larger empty ones. 
In cornfields and waste places, widely spread over central and 
southern Europe and western Asia. Not unfrequent in Britain, and 
perhaps truly indigenous. Jl. swmmer. 
4, V. dentata, Poll. (fig. 491). Narrow-fruited C.—Habit and foliage 
precisely those of V. Auricula, and the fruit is in the same manner 
crowned by the oblique border of the calyx, but the fruit is narrower, 
slightly compressed from front to back, and the seed occupies the 
entire cavity without any empty cells; these are represented by 2 
longitudinal ribs on the inner face of the fruit, which, when examined 
under the microscope, will be found to be hollow. 
The geographical range appears to be the same as that of V. Auricula, 
with which it is often confounded. fl. swmmer. It varies in its fruits 
more or less hairy, and the calyx-border sometimes cup-shaped, nearly 
as long as the fruit, and scarcely oblique, which form has been dis- 
tinguished as a species, under the name of V. ertocarpa, Desv. 
XLII. DIPSACEA. THE TEASEL FAMILY. 
Herbs or undershrubs, with opposite leaves, and no stipules. 
Flowers collected into compact heads or spikes, surrounded by 
a common involucre, with scales or hairs on the receptacle 
between the florets, as in Composite, but each floret is more- 
over inserted in a small ¢nvolucel having the appearance of an 
outer calyx, sometimes tubular, and completely enclosing the 
ovary ; sometimes cup-shaped at its base. Calyx combined with 
the ovary, with an entire or toothed border; the teeth often 
terminating in stiff points or bristles. Corolla monopetalous, 
_4- or 5-lobed, and often oblique. Stamens 4, inserted in the 
tube; the anthers free, not united as in Composite. Fruit 
small, dry, and indehiscent, crowned by the border of the 
calyx, often enclosed in the involucel, which assumes the form ° 
of an outer coating. Seed solitary, pendulous. 
A small family, spread over the temperate regions of the Old World 
both in the northern hemisphere and in southern Africa ; at once dis- 
_ tinguished from Composite by the anthers, from capitate Umbellifere 
by the opposite leaves and the monopetalous corollas. 
Scales of the receptacle between the florets prickly 3 : ; . 1. Drpsacus. 
Scales of the receptacle not prickly, or replaced by hairs. : . 2, SCABIOSA. 
I. DIPSACUS. TEASEL. 
Tall, erect biennials, either prickly or bearing very stiff hairs. Heads 
of flowers oblong or globular; the scales between the florets oblong and 
prickly. Involucels small and angular, with a very small, thickened 
border. Calyx with a small cup-shaped border appearing above the 
involucel. Corolla oblique, 4-lobed. 
