Saxifragaceae A. L. De Jussieu (Saxifrage Family) Herbs; Vessel

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Saxifragaceae A. L. de Jussieu (Saxifrage Family) Herbs; vessel elements with simple perforations; often with tannins, sometimes cyanogenic. Hairs often simple. Floral formula: Leaves usually alternate, sometimes in a basal rosette, simple to pinnately or palmately compound, entire to capsule, follicles serrate or dentate, with venation pinnate to palmate; Distribution and ecology: Widely distributed in temper- stipules lacking or represented by expanded margins ate and arctic regions, especially of the Northern Hemi- of the petiole base. Inflorescences determinate to inde- sphere, and often in mountainous terrain. terminate, usually terminal. Flowers bisexual to unisexu- al (plants then monoecious to ± dioecious), radial to Genera/species: 30/550. Major genera: Saxifraga (325 bilateral, with a variously developed hypanthium. Sepals spp.), Heuchera (55), Chrysosplenium (55), Mitella (20), and usually 4 or 5, distinct to connate. Petals usually 4 or 5, dis- Astilbe (20). In addition to the above listed genera, note- tinct, often clawed, sometimes variously dissected, imbri- worthy genera in the colder regions of the continental cate or convolute, sometimes reduced or lacking. Sta- United States and Canada include Boykinia, Leptarrhena, mens usually 3-10; pollen grains usually tricolpate or Sullivantia, Tellima, Tolmiea, and Tiarella. tricolporate. Carpels 2 (-5), ± connate or less commonly distinct; ovary superior to inferior, with axile or parietal Economic plants and products: Saxifraga, Astilbe, and a placentation; stigmas separate, capitate. Ovules usually few other genera are cultivated in rock gardens or peren- numerous on each placenta, with 1 or 2 integuments. nial borders. Nectar disk often present around base of ovary. Fruit a septicidal capsule or follicle (Figure 8.52). Figure 8.52 Saxifragaceae. Mitella diphylla: (A) flowering plant (x 0.75); (B) detail of raceme (x 4); (C) flower (x 15); (D) flower in longitudinal section (x 17); (E) dehisced anther (x 35); (F) immature capsule (x 9); (G) top view of immature capsule (x 9) (H) floral cup and capsule in cross-section (x 9); (I) erect "splash cup" capsule after dehiscence (x9); (J) seed (x 17). (From Sponberg 1972, J.Arnold Arbor. 53: p. 426.).

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