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FOC | Family List | FOC Vol. 7 | Magnoliaceae

11. Yulania Spach, Hist. Nat. Vég. Phan. 7: 462. 1839.

玉兰属 yu lan shu

Magnolia subg. Pleurochasma Dandy; M. subg. Yulania (Spach) Reichenbach.

Trees or shrubs, deciduous. Stipules membranous, adnate to petiole and leaving a scar on petiole. Leaves spirally arranged, folded in bud, erect when young; leaf blade membranous or thickly papery, margin entire or rarely 2-lobed at apex. Flowers terminal on brachyblasts, solitary, bisexual, appearing before or at same time as leaves, large and showy, usually fragrant. Tepals 9-15(-45), 3 per whorl, white, pink, purplish red, or rarely yellow, subequal, sometimes outer ones (perules) smaller, greenish or yellowish brown, and sepal-like. Stamens caducous; filaments flat; connective exserted and forming a long or short mucro; anthers dehiscing introrse-latrorsely or latrorsely. Gynoecium without a gynophore; carpels distinct; ovules 2(-4) per carpel; styles curved outward. Fruit usually terete when mature, often curved because of carpels partly abortive; mature carpels often distinct or rarely connate, leathery or subwoody, dehiscing along dorsal sutures, persistent on torus.

About 25 species: temperate and subtropical regions of SE Asia and North America; 18 species including one to six hybrid species (16 endemic, one introduced) in China.

Yulania kobus (Candolle) Spach (Magnolia kobus Candolle, nom. cons.; M. praecocissima Koidzumi), native to Japan and S Korea, is cultivated as a garden plant in Shandong and Zhejiang.

"Magnolia glabrata Y. W. Law & R. Z. Zhou" and "M. glabrata var. multipetala Y. W. Law & Q. W. Zeng" (in Y. H. Liu, Magnolias China, 62, 64. 2004) either represent hybrids between Yulania (Magnolia) species found in plantations grown for medicinal xinyi or could be a synonyms of already published taxa; however, they were not validly published because no Latin descriptions or diagnoses were provided and no types were indicated (Vienna Code, Art. 36.1 and 37.1).

1 Tepals unequal, outer ones sepal-like and much smaller than inner ones   (2)
+ Tepals subequal, outer ones not much smaller and sepal-like   (7)
2 (1) Flowers appearing at same time as or later than leaves; leaf blade conspicuously decurrent at base; stipular scar nearly 1/2 as long as petiole.   12 Y. liliiflora
+ Flowers appearing before leaves; leaf blade not decurrent at base; stipular scar less than 1/2 as long as petiole   (3)
3 (2) Mature carpels connate or densely aggregated, not curved, abaxially white lenticellate.   11 Y. cylindrica
+ Mature carpels distinct from each other, usually curved, tuberculate abaxially   (4)
4 (3) Gynoecium with trichomes   (5)
+ Gynoecium glabrous   (6)
5 (4) Young twigs yellowish green, densely pubescent; leaf blade varied in shape, obovate, ovate, obtriangular, or orbicular, apex obtuse with an acute acumen or emarginate or lobed.   13 Y. jigongshanensis
+ Young twigs purplish brown, glabrous; leaf blade obovate, apex obtusely rounded, with a shortly acute mucro.   16 Y. pilocarpa
6 (4) Twigs glabrous.   9 Y. biondii
+ Twigs with trichomes.   10 Y. stellata
7 (1) Tepals clawed at base; leaf blade elliptic or ovate   (8)
+ Tepals base usually not clawed; leaf blade obovate or elliptic-obovate   (9)
8 (7) Tepals 12-16, obovate-spatulate or oblong-ovate.   1 Y. campbellii
+ Tepals 33-48, narrowly elliptic.   18 Y. viridula
9 (7) Leaf blade usually emarginate or obtuse at apex   (10)
+ Leaf blade acute or shortly acuminate at apex   (11)
10 (9) Leaf blade obovate-spatulate or narrowly obovate, apex emarginate, abaxially dense silvery wavy villous; tepals 10-14.   2 Y. sargentiana
+ Leaf blade narrowly oblong-spatulate or obovate-oblong, apex obtuse, abaxially glabrous or with trichomes along veins; tepals 9-12.   3 Y. dawsoniana
11 (9) Twigs with trichomes   (12)
+ Twigs glabrous   (14)
12 (11) Leaf blade irregularly triangular; gynoecium densely villous.   14 Y. mirifolia
+ Leaf blade obovate; gynoecium glabrous   (13)
13 (12) Tepals pure white, sometimes reddish at base abaxially, outer ones equal to inner ones in length.   8 Y. denudata
+ Tepals pale to dark red, outer ones ca. 2/3 as long as inner ones.   17 Y. ×soulangeana
14 (11) Tepals 12-24   (15)
+ Tepals 9-12   (16)
15 (14) Leaf blade 10-18 cm, lower ca. 2/3 cuneate; each flower bud with 1 flower, tepals rosy (to red) outside, whitish within.   4 Y. sprengeri
+ Leaf blade 5-10 cm, base broadly cuneate; each flower bud with 2 or 3 flowers; tepals white.   15 Y. multiflora
16 (14) Leaf blade obovate to narrowly obovate-elliptic, apex acuminate to abruptly cuspidate, acumen 0.5-2 cm; tepals red or pale red.   5 Y. amoena
+ Leaf blade obovate-oblong, apex rounded, with an acuminate mucro; tepals pale purplish red   (17)
17 (16) Tepals 9, upper part white, lower part pale purplish red.   6 Y. zenii
+ Tepals 11(or 12), pale purplish red.   7 Y. elliptigemmata

  • List of lower taxa


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