The Families of Flowering Plants

L. Watson and M. J. Dallwitz


Glaucidiaceae (Himmelb.) Tamura

~ Paeoniaceae, Ranunculaceae

Habit and leaf form. Herbs. Perennial; rhizomatous (the rhizome short and thick, the stem unbranched, with only two or three leaves). Mesophytic. Leaves alternate; petiolate; non-sheathing; simple. Lamina dissected; palmatifid; palmately veined; cross-venulate; cordate. Leaves exstipulate. Lamina margins serrate, or dentate.

Stem anatomy. Primary vascular tissue in two or more rings of bundles (two rings). Medullary bundles present. Secondary thickening developing from a conventional cambial ring (in the rhizome). Vessel end-walls scalariform, or reticulately perforated. Sieve-tube plastids S-type.

Reproductive type, pollination. Plants hermaphrodite.

Inflorescence, floral, fruit and seed morphology. Flowers solitary; terminal; large; regular; partially acyclic. The androecium acyclic. Free hypanthium present. Hypogynous disk absent.

Perianth sepaline, or petaline, or of ‘tepals’ (usually described as having petaloid sepals and no corolla); 4; free; (if considered ‘of tepals’) petaloid; persistent. Calyx 4; polysepalous; persistent.

Androecium 350–500 (very numerous). Androecial members branched; maturing centrifugally; free of the perianth; free of one another; spiralled. Androecium exclusively of fertile stamens. Stamens 20–200 (very numerous); polystemonous; filantherous. Anthers tetrasporangiate. Pollen grains aperturate; 3 aperturate.

Gynoecium usually 2 carpelled (opposite the outer perianth members). The pistil 2 celled (below). Gynoecium apocarpous to syncarpous; semicarpous (the carpels united in the lower third); superior. Carpel 15–20 ovuled (‘many’). Placentation marginal. Ovary usually 2 locular (below). Ovules bitegmic; crassinucellate.

Fruit non-fleshy. The fruiting carpel dehiscent; a follicle (dehiscing along both dorsal and vental sutures). Seeds endospermic; winged (and compressed). Embryo well differentiated. Cotyledons 2.

Physiology, biochemistry. Not cyanogenic. Alkaloids absent.

Geography, cytology. Holarctic. Temperate. Japan. N = 10.

Taxonomy. Subclass Dicotyledonae; Crassinucelli. Dahlgren’s Superorder Ranunculiflorae; Ranunculales. Cronquist’s Subclass Magnoliidae; Ranunculales. APG (1998) Eudicot; peripheral Eudicot (non-core Eudicots, ‘neither Rosid nor Asterid’); Ranunculales (as a synonym of Ranunculaceae). Species 1. Genera 1; only genus, Glaucidium.

Tamura 1972, Bot. Mag. Tokyo 85, 40–.

Illustrations. • Glaucidium.


Cite this publication as: ‘L. Watson and M. J. Dallwitz (1992 onwards). The Families of Flowering Plants: Descriptions, Illustrations, Identification, and Information Retrieval. Version: 14th December 2000. http://biodiversity.uno.edu/delta/’. Dallwitz (1980), Dallwitz, Paine and Zurcher (1993, 1995, 2000), and Watson and Dallwitz (1991) should also be cited (see References).

Index