TREES AND SHRUBS 63 



CELTIS L. Hackberry 



A small tree; leaves ovate or ovate-lanceolate, taper-pointed, 

 thick, reticulated, cordate and very unequal at the base; flowers 

 greenish, axillary, the fertile solitary or in pairs, appearing with 

 the leaves; calyx 5- to 6-parted, persistent; stamens 5 or 6; ovary 

 1-celled with a single ovule. 

 A single species. 1. C. reticulate. 



HUMULUS. L. Hop Vine 

 A climbing perennial ; flowers dioecious, the staminate in loose 



axillary panicles, the pistillate in short axillary spikes; bracts folia- 

 ccous, imbricated; 'eaves palmately 3- to 5-lobed; fruiting calyx and 

 other parts of the plant covered with yellow resinous dots. 

 A single species in the timbered mountains. 1. H. lupulus neomexicanua 



MORUS. L. Mulberry 



Ours a small, scraggy t"?e with alternate, ovate, small about 1 to 

 2 inches long, serrate leavec, these usually 3- to 5-lobed, acute; 

 flowers dioecious, small, green and inconspicuous; the fruit techni- 

 cally a multiple fruit, consisting of a cylindrical or oblong cluster 

 of separate 1-seeded berries, the whole appearing to be a single 

 fruit. 



A single native specfes found in the drier 



mountains at from 5000 to 6000 feet altitude l. M. miorophylla.' 



