Pteroceltis ULMACEAE Celtis 



Woodland. Fig. 60. 



4. Trema Lour. [i|JfJ#li (Shan Huang Ma Shu; Mountain 



Yellow-hemp Genus) 



Evergreen: lvs. often 3-nerved at the base: fls. mostly unisexual: fr. a drupe. 

 About 30 species, widely distributed in tropical and subtropical regions; 3 in China. 

 (Greek term meaning "a hole", because the drupe has holes.) 



1. Trema dielsiana Hand.-Mazz. [l^Mt (Shan Yu Ma; Mountain Flax) (Lee 414). 

 Shrub or tree, to 6m.; fr. IX. China; locally in An., Che., Hun., Hup., Ki. 

 Roadside thickets. 



5. Zelkova Spach ff g (Chii Shu) 

 Deciduous: bark smooth or scaly: lvs. pinnately veined; fls. polygamous: fr. an 

 oblique drupe. 4 species, in Asia; 3 in China. (From "Zelkoua" or "Tselkwa", the 

 Caucasian vernacular name.) 



Key to the Species 



Lvs. densely pubescent beneath: brts. usually pubescent 1. Z. schneideriana 



Lvs. glabrous at maturity, or with tufts of hairs in the axils of the 

 veins beneath: brts. glabrous or slightly pubescent. 

 Lvs. small, about 3 cm. long, with tufts of hairs in the axils of 



the veins beneath : fr. 5-6 mm. across, nearly ovoid 2. Z. sinica 



Lvs. large, up to 10 cm. long, glabrous at maturity: fr. about 4mm. 



long, very oblique 3. Z. serrata 



1. Zelkova schneideriana Hand.-Mazz. A"H#jsf (Ta Yeh Chii Shu; Large-leaved 

 Zelkova) (R.M.183). Tree, to 20m.; fls. IV; fr. VIII-XI. China; locally in An., 

 Che., Hup., Ku. Woodland. Fig. 61. 



2. Zelkova sinica Schneid. $$$ (Chii Shu) (R.M.183). Tree, to 17m.; fls. IV; fr. 

 IX-X. China; locally in Hon., Hup., Ku. Woodland. 



3. Zelkova serrata (Thunb.) Mak. -J£Mffl>W\ (Kuan Yeh Chii Shu; Glossy-leaved 

 Zelkova) (R.M.183). Tree, to 30 m.; fls. IV; fr. VIII. Japan, China; locally in 

 An., Hun., Ku. Woodland. 



6. Celtis Linn. Hackberry ;J4JH (P'o Shu) 



Deciduous (ours): bark smooth: lvs. 3-nerved at the base: fls. polygamo-mono- 

 ecious; the fertile ones perfect: fr. a subglobose or ovoid drupe. 70 species, in north 

 temperate and tropical regions; 20 in China, some of them with edible frs. (From 

 the Latin name of an African species of lotus.) 



Key to the Species 



a. Brts. glabrous: lvs. crenate-serrate, qright green on both sides: fr. 

 solitary, black, 6-7 mm. in diam., on slender stalks longer than the 



petioles 1 • C. bungeana 



aa. Brts. pubescent : lvs. serrate, sometimes entire : fr. orange or reddish 

 brown. 

 Lvs. 3-10 cm. long: frs. 5-7 mm. in diam., on slender stalks. 



Frs. often 2 or 3 in a cluster, orange; stalk often 3-4 times 



the subtending petiole 2. C. biondii 



84 



