. The families of flowering plants. Plants; Phanerogams. 178 FAMILIES OF FLOWEEING PLANTS Family Dipterocaj-paceae. Wing-fruit family. Contains 16 genera and over 300 species, natives exclusively of the Asiatic tropics. They are trees of lofty proportions, resembling the Giittiferae in the abund- ance of resinous juice which they contain. The flowers are distin- guished by the calyx, which is divided into five unequal sepals, two of them very large and wing-like. The whole calyx forms a persistent crown on the fruit, which is of woody texture, 1-celled and l-seeded. The resin of various specie
. The families of flowering plants. Plants; Phanerogams. 178 FAMILIES OF FLOWEEING PLANTS Family Dipterocaj-paceae. Wing-fruit family. Contains 16 genera and over 300 species, natives exclusively of the Asiatic tropics. They are trees of lofty proportions, resembling the Giittiferae in the abund- ance of resinous juice which they contain. The flowers are distin- guished by the calyx, which is divided into five unequal sepals, two of them very large and wing-like. The whole calyx forms a persistent crown on the fruit, which is of woody texture, 1-celled and l-seeded. The resin of various species is used as a medicine and also as an illu- minant. Fig. 158 gives a good idea of the peculiar fruit. Family Elatinaceae. Water-wort family. This group of marsh or aquatic herbs consists of two genera, Elatine and Bergia, wirh about 25 species of wide distribution. They have opposite or whorled leaves, with small, regular flowers having 2-5 sepals, 2-5 petals, as many or twice as many stamens, and a 2-5- celled ovary becoming capsular in fruit. Family Frankeniaceae. Fran- kenia Family. Four genera and about 15 species of maritime under- shrubs of heath-like aspect, widely distributed in tropical or subtrop- ical regions. Frankenia is repre- sented by a species on the coast of southern California. The capsule differs from that in related families by being one-celled. Family Tamaricaceae. Tam- arisk Family. Contains 4 genera and about 40 species, trees or shrubs of wide distribution, with small alternate leaves and white or pink solitary ox clustered flowers. The ovary is of rather unusual structure, being imperfectly 3-celled by the intrusion of 3 placentas or partitions. The seeds bear tufts of hairs. Tamarix, the tamarisk of Europe, represented by several species, is a graceful small tree with handsome racemes of pink flowers. Myri- caria, a closely related genus, occurs in northern Europe and Asia. Beaumuria, a genus of low undershrubs, is found in the Mediterranean region a
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