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Article from New Trees by John Grimshaw & Ross Bayton
'Crataegus pseudoheterophylla' from the website Trees and Shrubs Online (treesandshrubsonline.
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Shrub or tree to 3 m. Branchlets glabrous or sparsely villous; thorns stout, to ~1.4 cm long. Buds 0.1–0.3 cm long. Leaves deciduous, 1.7–5.4 × 1.5–5.2 cm long, deltoid to rhomboid, upper surface dark green and villous along the veins, lower surface pale greyish green and villous in the vein axils, four to six secondary veins on each side of the midrib, margin with one to three lobes on each side of the midrib, lobe margins entire to irregularly serrate, apex acute to obtuse; petiole 0.6–3.6 cm long; stipules 0.4–2.1 cm long, serrate. Inflorescence corymbose, 2–4 cm long with 4–14 flowers; pedicels glabrous to villous. Flowers white; hypanthium glabrous, sepals triangular with entire margins (rarely with one to two teeth), petals 0.4–0.6 cm long, stamens 16–20 with purple anthers. Fruit 0.7–1.1 cm long, subglobose to ellipsoid, red, crowned by reflexed sepals, seeds one (to two). Flowering April to June, fruiting May to October (wild plants). Christensen 1992. Distribution AFGHANISTAN; ARMENIA; AZERBAIJAN; CHINA: Xizang; GEORGIA; INDIA: Kashmir; IRAN; KAZAKHSTAN; KYRGYZSTAN; PAKISTAN (?); RUSSIAN FEDERATION: Caucasus; TAJIKISTAN; TURKEY; TURKMENISTAN; UZBEKISTAN. Habitat Scrub, rocky mountain slopes and gorges, along rivers and on field margins, between 300 and 2700 m asl. USDA Hardiness Zone 4–5. Conservation status Not evaluated. Illustration Christensen 1992; NTxvi, NT287. Taxonomic note Three subspecies are recognised in C. pseudoheterophylla. Subsp. turkestanica (Pojark.) K.I. Chr. has villous pubescence on the pedicels, hypanthium, fruits, and occasionally on the branchlets. It ranges from Iran through central Asia to Tibet. Subsp. turcomanica (Pojark.) K.I. Chr. is largely glabrous and the leaves on flowering shoots are rounded or narrowly cuneate at the base. It occurs only in Turkmenistan, but is in cultivation at the Morton Arboretum. Subsp. pseudoheterophylla has villous pubescence on the fruits, hypanthium and upper parts of the pedicel; the leaves on flowering shoots are cuneate at the base. It occurs in Asian Turkey, Iran and the Caucasus.
Also related to Crataegus monogyna, C. pseudoheterophylla is another hawthorn from wide tracts of Eurasia that has only a tentative presence in cultivation. At Kew there are trees derived from collections made in the Zagros Mountains of Iran in 1977 (FLSX 497), now 3 m with densely tangled growth, and Bolu Province, Turkey in 1990 (TURX 111), currently 2.5 m tall. Material from the latter source is also cultivated at the Hillier Gardens, where it was 1.7 m tall in 2007. A tree (of horticultural origin) seen at the Morton Arboretum in 2006 was 5 m tall, forming a low, rounded, bushy specimen with rather sparse fruit, that certainly had no advantage over C. monogyna. Crataegus pseudoheterophylla is currently offered commercially in the United Kingdom.