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New Species of Maesa (Myrsinaceae) from China

1994; Missouri Botanical Garden Press; Volume: 4; Issue: 4 Linguagem: Inglês

10.2307/3391438

1945-6174

Jie Chen,

Plant Diversity and Evolution

Maesa striatocarpa, M. densistriata, and M. longilanceolata are described as new. All three are endemic to Yunnan, China. During my recent visit to the Smithsonian Institution and the Harvard University Herbaria, an examination of the rich collections of the Myrsinaceae revealed the following novelties. Maesa striatocarpa C. Chen, sp. nov. TYPE: China. Yunnan: Jianshui, Jiangwai, Guanyin shan, 2,000 m, 5 May 1933, H. T. Tsai 53314 (holotype, KUN; isotypes, GH, PE, US). Frutex 1-4(-5) m altus; ramulis glabris, tenuistriatis. Folia elliptico-ovata, 8-14.5 cm longa, 3.3-6 cm lata, membranacea vel chartacea, glabra, undulata, reflexa, acuminata; nervis lateralibus 7-10 jugatis. Folia, sepala, corolla, ovarium, et fructus longitudinaliter glandulosostriata. Inflorescentia paniculata, 5-12 cm longa, effusa; bracteolis ovatis; pedicellis ca. 1.5 mm longis. Sepala ovata, persistentia, basi connata, ciliata; corolla alba, brevi campanulata, lobis late ovatis vel subreniformis, tubo longioribus vel aequantibus, margine denticulata vel crenulata; staminibus ad medium tubi insertis, inclusis; ovario ovoideo. Fructus globosus, ca. 3 mm diametro, luteolus, sepalis prope ad summum fructus persistentibus. Shrubs 1-4(-5) m tall. Branchlets slender, straight or sometimes recurved, glabrous, angulate and very slightly striate; older branches with lenticels. Petiole 1-2 cm long; leaf blade elliptic-ovate, 8-14.5 cm long, 3.3-6 cm wide, membranous to papery, glabrous on both surfaces, base cuneate, rounded, obtuse, or sometimes subtruncate, margin reflexed, shallowly or deeply undulate with subglandular teeth, apex long acuminate, somewhat curved; lateral veins 7-10 pairs, ending in teeth. Leaf blades, sepals, corolla lobes, ovaries, and fruits usually densely longitudinally glandular striate. Inflorescences paniculate, terminal or axillary, 5-12 cm long, effuse; bracteoles ovate, entire, longitudinally glandular striate. Pedicel ca. 1.5 mm long. Flowers white, ca. 2 mm long. Sepals ovate, persistent, united at base, ciliate, glabrous. Corolla short campanulate, lobes equaling tube or longer, broadly ovate or subreniform, margin minutely denticulate or crenulate, apex rounded. Stamens included, inserted at middle of corolla tube; anthers broadly ovate or reniform, as NOVON 4: 322-323. 1994. long as filaments. Pistil included; style short, persistent; stigma flattened, slightly lobed. Fruits yellowish, globose, ca. 3 mm diam. Maesa striatocarpa is endemic to southeastern Yunnan, where it grows in dense broad-leaved forests and damp places and on hillsides at 1,3001,800 m. It was treated by Chen (1977, 1979) as M. striata Mez var. opaca Pitard, but the latter is a different taxon with a leaf apex only slightly subrounded. The new species differs from the related M. montana A. de Candolle (SW to SE China, IndoChina, Thailand, and tropical India) in having elliptic-ovate leaves, glabrous branchlets and pedicels, and a distinctly longitudinally glandular striate calyx. Paratypes. CHINA. Yunnan: Wenshan, alt. 1,900 m, 15 Jan. 1933, H. T. Tsai 51550 (GH, KUN, PE); Ping-bian, alt. 1,100 m, 20 June 1934, H. T. Tsai 60352 (GH, KUN, PE). Maesa densistriata C. Chen & C. M. Hu, sp. nov. TYPE: China. Yunnan: Luxi, Zhefang, near Nongqiu, ca. 1,200 m, 2 Dec. 1958, C. Chen 461 (holotype, KUN; isotype, PE). Frutex 1-2 m altus; ramulis angulatis, glabris, juvenis puberulis. Folia oblonga, elliptico-lanceolata, vel oblanceolata, 8.5-14 cm longa, 2.5-5.5 cm lata, chartacea, glabra, basi cuneata, serrata, dense longitudinaliter glanduloso striata, nervis lateralibus ca. 10-jugatis. Infructescentia 1.5-4 cm longa, paniculata, axillaris, glabra; bracteis lanceolatis, ca. 0.5 mm longis; bracteolis ovatis, glabris; pedicellis 1-2 mm longis. Floris ignotis. Fructus globosus, 3-4 mm diametro, paulo carnosus, glaber, eglandulosus; sepalis persistentibus ovato-triangularis, glabris, plus minusve ciliatis, apice glandulosis. Shrubs 1-2 m tall. Branchlets angular, sparsely puberulent when young, glabrescent when mature. Petiole ca. 1.5 cm long; leaf blade oblong, ellipticlanceolate to oblanceolate, 8.5-14 cm long, 2.55.5 cm wide, papery, glabrous on both surfaces, densely and minutely longitudinally glandular striate, base cuneate, margin serrate, apex acute or abruptly acuminate; midrib and lateral veins prominent especially abaxially, lateral veins ca. 10 pairs, ending in teeth. Infructescences axillary, paniculate, 1.5-4 cm long, many-branched, glabrous, inserted at leaf axils of 2-year-old branches; bracts lanceoThis content downloaded from 157.55.39.46 on Sat, 11 Jun 2016 06:40:53 UTC All use subject to http://about.jstor.org/terms Volume 4, Number 4 1994 Chen