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FNA | Family List | FNA Vol. 9 | Rosaceae | Crataegus

103g. Crataegus chrysocarpa Ashe var. vigintistamina J. B. Phipps, J. Bot. Res. Inst. Texas. 1: 1008. 2007.

Shrubs, 20–30 dm. Leaves: blade ovate to rhombic-ovate, base ± cuneate, sinuses: max LII 15–20%, lobe apex acute, veins 3–5 per side, abaxial surface glabrous or lamina sparsely hairy at anthesis, veins hairy, adaxial appressed-scabrous, glabrescent. Inflorescences: branches pubescent. Flowers 15–20 mm diam.; hypanthium hairy; stamens 20, anthers cream or ivory. Pomes red, suborbicular, 8–10 mm diam., glabrous.

Flowering May; fruiting Sep–Oct. Open brush; 100–400 m; Ont.; Minn., N.Y.

Variety vigintistamina is similar to var. chrysocarpa except with 20 stamens; it is frequent in parts of Minnesota, where it has the intermediate indumentum mentioned under var. chrysocarpa and var. faxonii. Crataegus divergens (Peck) Sargent, a prior name, with 10 to 18 stamens according to Sargent, is known from New York; its type (C. H. Peck 70) has ten stamens, preventing the name from being used for the current taxon.


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