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1. Ailanthus Desfontaines, Mém. Acad. Sci. (Paris). 1786: 265. 1788.

臭椿属 chou chun shu

Trees or small trees. Branchlets pubescent, with a pith. Leaves alternate, pinnate; leaflets 13-41, opposite or nearly so; blades papery or thinly leathery, base oblique, margin entire or serrate, apex acuminate, base sometimes 1- or 2-dentate on either side, teeth glandular abaxially at apex. Flowers small, polygamo-dioecious, in axillary or terminal thyrses. Sepals 5, imbricate. Petals 5, valvate. Disk 10-lobed. Stamens 10, inserted at base of disk, undeveloped or rudimentary in pistillate flowers. Carpels 2-5, free or slightly connate only at base; ovules 1 or 2 per locule, campylotropous or anatropous; styles 2-5, connate, but only with female trace in male flowers. Samarium oblong-elliptic, with a seed surrounded by wing. Seed flat, rounded, obovate or slightly deltoid, with some endosperm or without; endocarp thin; cotyledons compressed.

About ten species: Asia to N Oceania; six species (five endemic) in China.


1 Leaflet blade entire, base without marked teeth on either side; carpels 3-5   (2)
+ Leaflet blade entire, sinuous, or shallowly sinuous-dentate, base with 1 to several teeth on each side; carpels 5   (4)
       
2 (1) Small trees; carpels 5, lower portion of filaments glabrous.   3 A. fordii
+ Trees, 15-40(-45) m tall; carpels 3, filaments pilose proximally (unknown in A. guanxiensis)   (3)
       
3 (2) Samarium 4.5-8 × 1.5-2.5 cm.   1 A. triphysa
+ Samarium 12-15 × 3.5-4 cm.   2 A. guangxiensis
       
4 (1) Branches with soft thorns when young; leaflet blade with 2-4 teeth on either side, petiole sometimes with thorns.   4 A. vilmoriniana
+ Branches without soft thorns when young; leaflet blade base with 1 or 2 teeth on either side, petiole without thorns   (5)
       
5 (4) Branches yellow or yellow-brown, pilose when young, then glabrescent; leaflet blade margin entire.   5 A. altissima
+ Branches gray-white or gray-brown, pilose; leaflet blade margin sinuous or shallowly sinuous-dentate.   6 A. giraldii

Lower Taxa


 

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