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

95. Crataegus nananixonii J. B. Phipps & O’Kennon, Sida. 17: 569, fig. 1. 1997.

Nixon’s dwarf hawthorn

Shrubs, 10–15 dm. Stems ˂intricately branched˃; twigs: new growth reddish green, pubescent, 1-year old gray to gray-brown, older gray; thorns on twigs straight to slightly recurved, 2-years old dark dull gray, fine, 1–3 cm. Leaves: petiole length 20–40% blade, pubescence not recorded, gland-dotted; blade rhombic-ovate, 1.5–3.5 cm, base broadly cuneate, lobes 0 or with sinuses very shallow, margins ± irregularly serrate, ˂some teeth gland-tipped, especially proximally˃, veins 3 per side, apex acute, abaxial surface glabrous, veins sparsely pubescent, adaxial sparsely scabrous young, glabrescent. Inflorescences 3–5-flowered; branches pubescent; bracteole margins short-stipitate-glandular. Flowers 12–15 mm diam.; hypanthium glabrous; sepals ˂lanceolate˃, 4–5 mm, margins glandular, ˂abaxially glabrous˃; ˂petals slightly clawed˃; stamens 10, anthers rose-purple; styles 3–5. Pomes coppery red, suborbicular, 10 mm diam., glabrous; sepal ˂remnants present or not˃, on collar, patent-reflexed; pyrenes 3–5.

Flowering Apr; fruiting Sep–Oct. Open sandy sites; 200 m; Tex.

Crataegus nananixonii is restricted to open sandy sites in Nacogdoches and nearby counties of eastern Texas. The species is a very dwarf and distinctive member of ser. Intricatae, similar to C. biltmoreana but with much smaller parts.


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