SOME MINOR GENERA . 311 
disk-florets have become rayed. They flower in July. The species was 
introduced from Mexico in 1798. Seeds should be sown in a compost 
of light sandy loam and peat. 
TaNaceTuM. ‘Tansy. Somewhat shrubby, strong-scented herbs, 
of which one species is native. Grown chiefly on account of the 
minutely-dissected foliage. All the florets are tubular, yellow. Tana- 
cetwm vulgare is grown for garnishing and for use in rustic medicine 
Its dull yellow corymbs do not entitle it to a place in the garden. 7. 
leucophyllwm, from Turkestan, has silvery white foliage, and brighter 
yellow flower-heads. They are perennials, and thrive anywhere, with- 
out care. 
PETASITES (from Latin, petasus, a broad-brimmed hat, in allusion to 
size of leaves). Butter-bur. Petasites fragrans, the Winter Heliotrope, 
is sometimes grown in the wilder parts of gardens. Its habit is very 
like that of the Common Coltsfoot, but its flowers are more like those 
of the Butter - bur, lilac- white or purplish, fragrant; December to 
February. Will thrive in any rough place. It is naturalised in parts 
of Britain. 
Venipium. A genus of South African herbs, of which one is 
cultivated—Venidiwm calendulaceum. As its name indicates, its 
flower-heads are similar to those of the Common Marigold, with clear 
yellow rays and darker disk ; but the two plants are very different. 
Venidium has trailing stems upon which the lobed leaves and upright 
flowering stems (6 to 12 inches high) occur in tufts. Flowers July to 
October. It may be grown as an annual by sowing the seed on a hot- 
bed in March, planting out the seedlings in a sunny position. 
Ecutnops (Greek, echinos, a hedgehog, and opsis, likeness). Globe 
Thistles. A large genus of Thistle-like herbs having the flower-heads 
each containing but one flower, but the heads gathered into dense 
masses at the ends of the branches, each cluster thus resembling a 
single flower-head. On dissecting this it will be found that each 
flower has its own prickly involucre. They are rather coarse- 
growing plants, but present a fine appearance in shrubberies where 
there is plenty of room. They grow without special care, and if 
allowed will become naturalised. Several species are in cultivation, 
including — Echinops bannaticus, introduced from Russia in 1816 
under the name of E. ruthenicus, a showy border plant, 2 to 4 feet 
high, with blue flower-heads, and rough, spiny, and downy leaves. 
