succulent torus, which in the other genera is dry. In Geum (avens) and Dryas (an arctic and alpine genus) the style is persistent In the

After Wossidlo, from Strasburger's Lehrbueh der Bohmik, by permission of Gustav Fischer.

FIG. 2.-Pyrus communix (pear). I, flowering branch; 2, a flower cut through longitudinally; 3, longitudinal section of fruit; 4, floral diagram. fruit, forming a feathery appendage (Dryas) or a barbed awn (avens), either of which is of service In distributing the fruit. The Potentilleae are chiefly north temperate, arctic and alpine plants.

After Wossidlo, from Strasburger's Lehrbuch der Bolanik, by permission of Gustav Fischer.

FIG. 3.-Rubus fnfticosus (blackberry). . flowering branch; 2, longitudinal section of a flower; 3, fruit; 4, floral diagram.

The Roseae comprise the large genus Rosa, characterized by a more or less urn-shaped torus (fig. 4) enclosing the numerous carpels which form dry one-seeded fruits enveloped in the bright coloured fleshy torus. The numerous stamens surround the mouth of the torus. The plants are shrubs bearing prickles on the stems and leaves; many species have a scrambling habit resembling the brambles. The species of Rosa, like those of Rubus, are extremely variable, and a great number of subspecies, varieties and forms have been described. The Sanguisorbeae are a reduced form of Rosoideae. The dry one-seeded fruit is enclosed in the urn-shaped torus, which, however, is dry and inconspicuous, and the number of carpels is much reduced, sometimes to one (figs. 2, 5, 6). Petals are often wanting, as in Alchemilla (lady's mantle) and Pdterium, and the flowers " are often uni sexual and frequently wind pollinated, as in salad burnet (Poterfium Sanguisorba), where the small flowers are crowded in heads, the upper pistillate, with protruding feathery stigmas, ' . and the lower staminate (or bisexual), with exserted stamens. Agrimonia — V (agrimony) has a long s ike of small honey less flowers with yellbw petals; in the fruit the torus becomes hard and crowned by hooked bristles which ensure the distribution of the enclosed achenes. Suborder IV. Neuradoideae contains only two genera of desert-inhabiting B herbs with yellow flowers; and the five to ten carpels are united together and with the base of the cup-shaped torus, which enlarges to form a dry covering round the one-seeded fruits. Suborder V. Prunoideae (fig. 7) is characterized by a free solitary carpel with a terminal style and two pendulous ovules, and the fruit a one-seeded drupe. The torus forms a cup from the edge of which spring the five sepals, five alter-After Duchartre, from Strasburger's Lehrbuch der Bolanik, by permission of Gustav Fischer.

FIG. 4.-Fruit of Rose, consisting of the fleshy hollowed axis, s', the persistent sepals s, and the carpels fr. The stamens e have withered. nating petals and the ten to indefinite stamens. The plants are deciduous or evergreen trees or shrubs with simple leaves, often

FIG. 5.-Carpel of FIG. 6.-Floral Dia-Lady's Mantle (Alchemilla) with lateral style s; 0, 0 V a r y; st, stigma, enlarged. gram of Sanlguisorba. . b, bract; o/, B, bracteoles; d, disk.

with small caducous stiipules, and racemes or umbels of generally showy, white or pink owers. There are five genera, the chief of which is Prunus, to which belong the plum (Prunus commuuis), with several well-marked subspecies-P. s 'nom (sloe or blackthorn), P. insititia (bullace), P. domestic wild lum), the almond (P. Amygdalus), with the nearly allied peacli (P. persica), cherry (P. Cerasus), bird cherry (P. Padus) and cherry

After Wossidlo from Strasburger's Lehrbuch der Balanik, by permission of Gustav Fischcr.

FIG. 7.-Prunus Cerasus. I, flowering branch: 2, a flower cut through longitudinally; 3, fruit in longitudinal section. laurel (P. Laurocerasus). The tribe is distributed through the north temperate zone, passing into the tropics.

Suborder VI. Chrysobalanoideae resembles the last in having a single free carpel and the fruit a drupe, but differs in having the style basal, not terminal, and the ovules ascending, not pendulous; the flowers are also frequently zygomorphic. The 12 genera are tropical evergreen trees or shrubs, the great majority being South American. The zygomorphic flowers indicate an afhnity with the closely allied order Leguminosae.