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The families of flowering plants

L. Watson and M.J. Dallwitz

Baueraceae Lindl.

~ Cunoniaceae.

Including Codiaceae Van Tiegh.

Habit and leaf form. Shrubs. Helophytic, or mesophytic. Leaves opposite; sessile; compound; ternate. Lamina palmately veined (the leaflets pinnately veined). Leaves exstipulate. Lamina margins serrate.

Leaf anatomy. Hairs present, or absent; eglandular, or glandular. Minor leaf veins without phloem transfer cells.

Axial (stem, wood) anatomy. Nodes unilacunar. Secondary thickening presumably developing from a conventional cambial ring (?).

Reproductive type, pollination. Plants hermaphrodite.

Inflorescence, floral, fruit and seed morphology. Flowers solitary; axillary.

Perianth with distinct calyx and corolla; (8–)12–16(–20); 2 whorled; isomerous. Calyx (4–)6–8(–10); 1 whorled; polysepalous; persistent; imbricate (slightly), or valvate. Corolla (4–)6–8(–10); 1 whorled; polypetalous; imbricate; magenta pink.

Androecium 4–10, or 15–100 (to ‘many’). Androecial members free of the perianth; free of one another; 1 whorled, or 2 whorled. Androecium exclusively of fertile stamens. Stamens 15–30; isomerous with the perianth to polystemonous. Anthers non-versatile; dehiscing via short slits (these apical, the openings sometimes confluent over the anther tip); introrse. Pollen grains aperturate; 2-celled.

Gynoecium 2 carpelled. The pistil 2 celled. Gynoecium syncarpous; synovarious; superior to partly inferior. Ovary 2 locular. Styles 2; free. Stigmas 2; dry type; papillate; Group II type. Placentation axile, or apical. Ovules 2–15 per locule (to ‘numerous’); pendulous, or horizontal, or ascending; anatropous; bitegmic; crassinucellate. Outer integument contributing to the micropyle. Embryo-sac development Polygonum-type. Polar nuclei fusing prior to fertilization. Antipodal cells formed; 3; not proliferating; ephemeral. Synergids pear-shaped. Endosperm formation nuclear.

Fruit non-fleshy; dehiscent; a capsule. Capsules loculicidal. Seeds endospermic. Endosperm oily. Embryo straight.

Seedling. Germination phanerocotylar.

Physiology, phytochemistry. Not cyanogenic. Proanthocyanidins present; delphinidin. Flavonols present; quercetin and myricetin. Ellagic acid absent. Aluminium accumulation not found.

Geography, cytology. Temperate to sub-tropical. Australia.

Taxonomy. Subclass Dicotyledonae; Crassinucelli. Dahlgren’s Superorder Rosiflorae; Cunoniales. Cronquist’s Subclass Rosidae; Rosales. APG III core angiosperms; core eudicot; Superorder Rosanae; fabid. APG IV Order Oxalidales (as a synonym of Cunoniaceae).

Species 3. Genera 1; only genus, Bauera.

General remarks. Seemingly differing from Cunoniaceae (q.v.) in the sessile, exstipulate leaves and unilacunar nodes; non-versatile short-slitted anthers; also the seed with a non-zig-zag micropyle?.

Illustrations. • Bauera microphylla (as rubioides var.): Hooker, Fl. Tasmaniae (1860). • Bauera rubioides: Nat. Pflanzenfam.IV (1895). • Bauera rubioides: Bot. Mag. 20 (1803). • Bauera rubioides (Chittenden).

We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, distributions of character states within any set of taxa, geographical distribution, genera included in each family, and classifications (Dahlgren; Dahlgren, Clifford, and Yeo; Cronquist; APG). See also Guidelines for using data taken from Web publications.

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 1992 onwards. The families of flowering plants: descriptions, illustrations, identification, and information retrieval. Version: 5th March 2018.’.