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15. Claytonia perfoliata Donn ex Willdenow, Sp. Pl. 2: 1186. 1798.
Miner’s-lettuce
Montia perfoliata (Donn ex Willdenow) Howell
Plants annual, with minute, tuberous bodies; periderm absent. Stems 5-50 cm. Leaves: basal leaves in suberect to erect, seldom flattened rosettes, petiolate, 1-30 cm, blade often with weak red pigmentation, broadly rhombic to deltate or reniform, 1-7 × 0.5-5(-6) cm, apex obtuse to apiculate, mucro 1-3 mm; cauline leaves sessile, blade perfoliate or cleft or notched, 10 cm diam. or less. Inflorescences 1-bracteate; bract leaflike, 0.5-15 mm. Flowers 3-10 mm; sepals 1.5-4 mm; petals pink or white, 2-5 mm; ovules 3. Seeds 2-5 mm, shiny and smooth; elaiosome 1-3 mm. 2n = 12, 24, 36, 48, 60.
Subspecies 3 (3 in the flora): w North America (including Mexico), Central America (Guatemala); adventive in Europe, Pacific Islands (New Zealand).
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| 1 |
Basal leaf rosettes erect, 20-50 cm; cauline leaf pairs connate into perfoliate discs, blade margins entire; seeds 3-5 mm... |
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15c subsp. perfoliata |
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Basal leaf rosettes suberect to flattened, 2-30 cm; cauline leaf pairs perfoliate, blade margins notched or deeply cleft; seeds 2-4 mm |
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(2) |
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| 2 (1) |
Basal leaf blades ovate to broadly rhombic, apex obtuse; leaf blades often beet red, gray-green, or purplish; epidermal gas pockets easily seen in field; seeds 3-4 mm |
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15a subsp. intermontana |
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Basal leaf blades deltate, apex apiculate; leaf blades mostly green; not beet red; epidermal gas pockets usually not visible (except in populations of California Transverse Ranges); seeds 2-3 mm |
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15b subsp. mexicana |
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