Saxifragaceae

Abstract

Perennial herbs, rarely annual or biennial, often rhizomatous. Leaves rosulate, alternate, on the inflorescence axis rarely opposite, simple or less often pinnately or palmately compound or decompound, margin various, from entire to lobed, crenate, or toothed; leaf base often sheathing, leaves on inflorescence often stipulate. Inflorescences cymose to racemose. Flowers perfect or sometimes some or all unisexual, regular to less often irregular, perigynous to often partly or wholly epigynous, homostylous (heterostylous in Jepsonia); hypanthium free from or variously adnate to base of ovary; calyx lobes (3-)5(-10); petals generally (4)5(6), sometimes 0, clawed or rarely cleft or dissected, well-developed or less often relatively small and inconspicuous; stamens usually 5 or 10, anthers basi fixed in basal pit, tetrasporangiate and dithecal, opening by longitudinal slits, bisporangiateand opening terminally in Leptarrhena and Tanakaea; gynoeciumof 2(3)carpels, these connate at least at verybaseanddistallyfreetoformholloworsolid stylodia terminated by capitate, rarely decurrent stigmas; ovules numerous and anatropous, usually bitegmic (unitegmic in Micranthes and Darmera), crassinucellate, on axile or parietal placentae. Fruit capsular or follicular; seeds typically numerous, small; endosperm present.

Keywords

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