Perennial herbs. Stems simple or branched. Leaves cauline, alternate, simple; stipules absent; petiole present or absent; blade margins sharply serrate or doubly serrate. Inflorescences terminal, scorpioid racemes. Flowers bisexual; perianth and androecium hypogynous or perigynous; hypanthium present; sepals 5(-8), connate proximally; petals absent or 1-8, distinct; nectary disc absent; stamens 10, distinct, adnate to rim of hypanthium; anthers dehiscent by longitudinal slits; pistils 1, (4-)5(-8)-carpellate, connate basally and laterally, partially adnate to hypanthium; ovary superior or partially inferior, (4-)5(-8)-locular proximally; placentation marginal; ovules anatropous, bitegmic, crassinucellate; styles 1 per carpel, distinct; stigmas 1 per carpel, terminal, capitate. Fruits capsular, dehiscence circumscissile proximal to free portion of styles. Seeds 300-400, tan, yellowish brown, or pinkish, ellipsoid to subfusiform, funicular end more tapered; embryo straight; endosperm scant, cellular. SELECTED REFERENCES Baldwin, J. T. and B. M. Speese. 1951. Penthorum: Its chromosomes. Rhodora 53: 89-91. Haskins, M. L. and W. J. Hayden. 1987. Anatomy and affinities of Penthorum. Amer. J. Bot. 74: 164-177. Spongberg, S. A. 1972. The genera of Saxifragaceae in the southeastern United States. J. Arnold Arbor. 53: 409-498. SELECTED REFERENCES Baldwin, J. T. and B. M. Speese. 1951. Penthorum: Its chromosomes. Rhodora 53: 89-91. Haskins, M. L. and W. J. Hayden. 1987. Anatomy and affinities of Penthorum. Amer. J. Bot. 74: 164-177. Spongberg, S. A. 1972. The genera of Saxifragaceae in the southeastern United States. J. Arnold Arbor. 53: 409-498. Perennial herbs. Stems simple or branched. Leaves cauline, alternate, simple; stipules absent; petiole present or absent; blade margins sharply serrate or doubly serrate. Inflorescences terminal, scorpioid racemes. Flowers bisexual; perianth and androecium hypogynous or perigynous; hypanthium present; sepals 5(-8), connate proximally; petals absent or 1-8, distinct; nectary disc absent; stamens 10, distinct, adnate to rim of hypanthium; anthers dehiscent by longitudinal slits; pistils 1, (4-)5(-8)-carpellate, connate basally and laterally, partially adnate to hypanthium; ovary superior or partially inferior, (4-)5(-8)-locular proximally; placentation marginal; ovules anatropous, bitegmic, crassinucellate; styles 1 per carpel, distinct; stigmas 1 per carpel, terminal, capitate. Fruits capsular, dehiscence circumscissile proximal to free portion of styles. Seeds 300-400, tan, yellowish brown, or pinkish, ellipsoid to subfusiform, funicular end more tapered; embryo straight; endosperm scant, cellular.General Information
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Literature
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Flora of North America @ efloras.org
Literature
