24.4, POPULAR FIELD BOTANY. 
on one stalk. Seed-vessel hairy, and two-seeded. Leaflets 
numerous. 
ERvuM TETRASPERMUM. Smooth Tare. Found m most corn- 
fields and hedges in England. Scarcely known in Scotland, 
and not at all in Ireland. Much smaller and more slender 
than the last. Two flowers only on a bunch, the seed-vessel 
smooth and four-seeded, so that by examination it is easily 
distinguished. Leaflets fewer. They are both pretty, deli- 
cate little plants. 
DIADELPHIA. DECANDRIA. 
CALYCIFLOR&A. FAapaceE®. 
ORNITHOPUS. (Brrp’s-root.) 
Generic Character. Seed-vessels round, long, and curved, the 
numerous seeds conspicuously show their shape, which makes 
the pods look like a bird’s foot. 
ORNITHOPUS PERPUSILLUS. (Plate XV. Fig. 57.) Common 
Bird’s-foot. Yn every respect this is a most beautiful little 
plant, both as regards leaves, flowers and pods. It is found 
in dry and gravelly soil, and is generally not many inches 
long, but I have found it late in the autumn, from three to 
four feet in length. The stem is branched and spreading at 
