Clethra CORNACEAE-ERICACEAE Pijrola 



2. METACHLAMYDEAE (Gamopetalae) ^*ftE (Ho Pan Hua Ch'iu) 

 Calyx and corolla both present; the petals more or less united. 



133. CLETHRACEAE White Alder Family |l|ffll4 (Shan Liu K'o) 



Shrubs or trees with stellate pubescence: lvs. alternate, short-petiolate, estipulate, 

 serrate: fls. in terminal or axillary racemes or panicles; sepals and petals 5, distinct; 

 stamens 10, hypogynous; anthers opening by pores; ovary superior, 3- or 5-celled; 

 style slender, 3-cleft or simple: fr. a 5- or 5~valved many-seeded capsule. 2 genera 

 with about 30 species. 



1. Clethra Linn. White Alder U-lfPM (Shan Liu Shu; 

 Mountain-willow Genus) 



Inflorescence terminal; sepals entire, accrescent and persistent; ovary and capsule 

 3-celled. 30 species, chiefly in the Americas, eastern Asia and Malaya; 10-15 in 

 China. (Greek: klethra, alder.) 



Key to the Species 



Lvs. stellate-tomentose beneath; blades 10-16 cm. long 1. C. brammeriana 



Lvs. pubescent or nearly glabrous beneath; blades 6-14 cm. long 2. C. fargesii 



1. Clethra brammeriana Hand.-Mazz. (H.-M. 7:761). Shrub; fls. white; infl. brown- 

 tomentose. Central China; locally in Ki. Woodland. 



2. Clethra fargesii Franch. (R.M. 690). Shrub, to 4m.; fls. white, fragrant, VIII; 

 infl. brown-pubescent. Central China; locally in An., Hup. Woodland. 



134. PYROLACEAE Wintergreen Family WBW-Pc (Lu T'i Ts'ao K'o) 

 Herbs or low shrubs, sometimes parasitic, with alternate siynple estipulate lvs. and 

 perfect regular 5-merous polypetalous fls. : infl. solitary or of terminal clusters; sta- 

 mens 10, distinct to the base; anthers often opening by apical pores; style and stigma 

 one: fr. a 5-valved capsule with many seeds. 10 genera with 32 species, in the arctic 

 and temperate regions; 3 genera and 5 species in China. 



1. Pyrola Linn. Wintergreen WMW-Wb (Lu T'i Ts'ao Shu) 

 Low glabrous perennial herbs with evergreen basal lvs. and nodding fls. in a 

 simple raceme on an erect scape; petals 5, distinct; anthers opening by 2 pores at 

 the base; style 1; stigma 5-lobed or -parted: capsule loculicidal, opening from the 

 base upward; seeds minute. About 15 species, in northern regions; 3 in China. (The 

 name is the diminutive of Pyrus, on account of the supposed resemblance of the 

 foliage to that of the pear tree.) 



1. Pyrola rotundifolia Linn. $MM (Lu T'i Ts'ao; Stag-hoof Herb) (G.M. 1112). 

 Scape 5-25 cm. high; fls. white, VI; fr. VII. Eurasia, North America; locally in 

 Ki. Woodland shade. Fig. 279. 



135. ERICACEAE Heath Family ftrlM (Tu Chuan K'o) 

 Shrubs or small trees, often evergreen, with estipulate lvs. and perfect often 

 showy 4-5-merous fls.; corolla usually gamopetalous; stamens at the base of a disk; 

 anthers opening mostly by pores; ovary 2-5-celled; style and stigma owe: fr. a capsule 

 or berry with small seeds. 70 genera with 1900 species; in cold and temperate regions; 

 14 genera and 280 species in China. 



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