138 URTICACEZ. 
Order CXXVII. URTICACE. 
Urticacee, Benth: et Hook. Gen. Plant. iii. p. 341. 
This order comprises upwards of 1500 species referred to 108 genera, and it is 
represented in all tropical and temperate regions. 
Tribe I. ULMEZ. 
Ulmee, Benth. et Hook. Gen. Plant. iii. p. 3438. 
Four genera, three of which are monotypic; and one of these is endemic in Brazil: 
the rest are confined to the northern hemisphere. 
1. ULMUS. 
Ulmus, Linn. Gen. Plant. n. 316; Benth. et Hook. Gen. Plant. iii. p. 351. 
About sixteen arboreous species, widely dispersed in the temperate regions of the 
northern hemisphere—one occurring in the subtropical region of Sikkim, and the 
following on the mountains within the tropics. 
1. Ulmus mexicana, Planch. in DC. Prodr. xvii. p. 156. 
Chetoptelea mexicana, Liebm. in Vidensk. Meddel. 1850, pp. 74-78, et in K. Dansk. Vidensk. 
Selsk. Skrift. ser. 5, ii. p. 8386 (reprint, p. 52). 
South Mexico, Mirador at 3000 feet (Liebmann), Orizaba (Botteri, 878, M68 
Sumichrast, 871). Hb. Kew. 
Tribe II. CELTIDEA. 
Celtidee, Benth. et Hook. Gen. Plant. iii. p. 343. 
Nine genera, comprising nearly 120 species, spread over nearly the whole area of the 
order. 
2. CELTIS. 
Celtis, Linn. Gen. Plant. n. 1143; Benth. et Hook. Gen. Plant. iii. p. 354. 
Shrubs and trees, inhabiting the temperate and tropical regions of both hemispheres, 
but chiefly the northern. Seventy species are enumerated, though Bentham and 
Hooker estimate there are scarcely fifty distinct ones. 
1. Celtis aculeata, Sw. Prodr. p. 53, et Fl. Ind. Oce. i. p. 545 ; DC. Prodr. 
xvii. p. [86, 
Rhamnus iguaneus, Linn. ; Cav. Ic. Pl. iii. p. 48, t. 94. 
Zizyphus iguanea, Lam. Dict. iii. p. 318. 
Mertensia iguanea et M. commutata, Roem. et Schult. Syst. Veg. vi. p. 312. 
Celtis epiphylladena, Ort. Dec. p. 79. 
Momisia ehrenbergiana, Kl. in Linnea, xx. p. 538. 
Celtis ehrenbergiana, Liebm. in K. Dansk. Vidensk. Selsk. Skrift. ser. 5, ii. p. 339. 
