A revision of the genus Malus Mill. (Rosaceae) Author Liu, Jian-quan liujq@lzu.edu.cn Author Gao, Xin-fen Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization and Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China. School of Life Science, Sichuan University, Chengdu 610065, Sichuan, China. University of Chinese Academy of Sciences, Beijing 100049, China. xfgao@cib.ac.cn text European Journal of Taxonomy 2022 2022-12-28 853 1 127 http://dx.doi.org/10.5852/ejt.2022.853.2019 journal article 222443 10.5852/ejt.2022.853.2019 aedbf741-3844-4f1b-9c45-5504394416a9 2118-9773 7501371 9 . Malus rockii Rehder Figs 25–26 Journal of the Arnold Arboretum 14 (3): 206 ( Rehder 1933 ) . Pyrus rockii (Rehder) M.F.Fay & Christenh. , Plant Gateway’s The Global Flora : A Practical Flora to Vascular Plant Species of the World. Vol. 4 : 118 (Christenhusz et al. 2018 ). – Type : CHINA • Yunnan , west of Talifu , Mekong watershed , on the road to Young-chang and Tengyueh beyond Lampba , along watercourses ; alt. 7000 ft ; Sep.-Oct. 1922 ; fr; J.F. Rock 6842 ; type : A [ A00026653 ]!; isotype: US[US00097446] ! Pyrus baccata γ himalaica Maxim ., Bulletin de l’Académie impériale des Sciences de Saint-Pétersbourg 19: 171 ( Maximowicz 1874 ). – Malus baccata var. himalaica (Maxim.) C.K.Schneid. , Illustriertes Handbuch der Laubholzkunde Vol. 1 : 721, fig. 397s ( Schneider 1906b ). – Malus baccata subsp. himalaica (Maxim.) Likhonos , Trudy po prikladnoi botanike genetike i selektsii 52 (3): 28 ( Likhonos 1974 ) . Examined specimens CHINA – Chongqing • Shizhu ; 1 May 1978 ; fr; W.H. Wang 309 ; CDBI • Nanchuan ; 20 Apr. 1996 ; fl; Z.Y. Chen 17984 ; PE • Chengkou ; 1 Jul. 1958 ; fr; T.L. Dai 105708 ; CDBI . – Guangxi • Quanzhou ; 1 Jun. 2005 ; fr; Q. Li 0654 ; PE . – Shaanxi • Foping ; 7 Jul. 1952 ; fr; B.Z. Guo 1592 ; CDBI • ibid.; 1 Jun. 1952 ; fr; K.J. Fu 4541 ; CDBI . – Sichuan • Kangding ; 19 May 1961 ; fl; S. Jiang et al. 2860 ; PE • Ganzi ; 18 Jul. 1961 ; fr; S. Jiang et al. 9448 ; PE • Zhaojue ; 2 Apr. 1982 ; fl; Jiang et al. 19A ; PE • Longquanshan ; 1 Mar. 1979 ; fl; B.C. Gao 8775 ; CDBI • Yanyuan ; 25 Apr. 2007 ; fl; Y.Y. Gen , D.H. Zhu & X.J. Li 20070223 ; WCSBG . – Tibet • Jilong ; 7 Sep. 1990 ; fr; B.S. Li et al. 13565 ; PE • Chayu ; 28 Jul. 1980 ; fr; Ni et al. 0877 ; PE • Bomi ; 27 Jun. 1965 ; fr; J.S. Ying & D.Y. Hong 650338 ; PE • ibid.; 11 May 1976 ; fl; Qingzang Zhibei Group 11655 ; PE • Jilong ; 2 Jun. 1972 ; fl; Xizhang zhongcaoyao Expedition 84 ; PE . – Yunnan • Deqin ; s.d.; fr; G. Forrest 12846 ; IBSC • Weixi ; 20 Jul. 1981 ; fr; Institute of Beijing botany Hengduanshan Team 01720 ; PE • ibid.; 20 Sep. 1974 ; fr; P. Zhang 74084 ; PE • Zhongdian ; 14 Jun. 1981 ; fl; Qingzang- Hengduanshan Team 1028 ; PE • Jingdong ; 24 Jul. 2003 ; fr; G.P. Yang 117 ; PE • Dali ; 17 Sep. 2009 ; fr; Z.J. Yin et al. 2419 ; PE . Description Tree, 8‒10 m high. Branches terete, crinite when young, glabrescent. Leaves petiolate, petiole ca 2.3 cm long, crinite. Lamina 5.3‒7.2 (12) × 2.9‒3.7 cm, elliptic to ovate, base rounded, cordate or cuneate, oblique, apex acuminate, margin serrulate, blade puberulous abaxially or on midvein. Inflorescence umbellate, with 4‒8 flowers. Pedicel ca 3.3 cm long, lanuginous. Hypanthium densely puberulous. Sepals lanceolate-triangular, abaxially puberulous or glabrous, adaxially densely puberulous, caducous. Petals ca 1.4 × 0.9 cm, white, obovate. Stamens 20‒25, unequal. Styles 4 or 5, longer than stamens, basally crinite. Pome ca 1.0‒1.5 cm in diameter, subglobose, tapering, red. Carpopodium ca 3.8 cm long, puberulous. Phenology Flowers from May to June. Mature fruits in September. Habitat Terrestrial, seasonally green, growing in mixed forests on slopes or in valleys; 1500‒3800 m a.s.l. Fig. 25. Distribution of Malus rockii Rehder. Fig. 26. Morphological characters of Malus rockii Rehder. US 00097446 (isotype), K000758448, K000758450, NAS00002410, NAS00002396. Scale bars = 10 mm. Distribution China (Chinging, Guangxi , Shaanxi , Sichuan , Tibet , Yunnan ) ( Fig. 25 ). Chromosome numbers 2n = 34, 51, 54, 68. Note Flora of China (Ku & Spongberg 2003) considered Pyrus baccata var. himalaica Maxim. and Malus rockii Rehder as nomenclatural synonyms. We agree with this treatment.