ULMACEAE. 



VOL. I. 



4. Celtis georgiana Small. Georgia 

 Hackberry. Fig. 1548. 



C. georgiana Small, Bull. Torr. Club 24 : 

 439. 1897. 



A shrub, or small tree, up to 30 

 high, the young twigs slender, pubes- 

 cent becoming purple-brown and. 

 glabrous. Leaves ovate, small, rarely 

 over 2' long, firm when mature, 

 acute or bluntish, serrate, or some- 

 times nearly or quite entire, the up- 

 per surface bright green, scabrous, 

 the under side pubescent, at least on 

 the veins ; drupe globose, 3"~4" in 

 diameter, red-purple to yellowish, 

 borne on short peduncles 2 "-4" long. 



Rocky or gravelly soil, New Jersey 

 to Missouri, Florida and Alabama. 

 April-May. 



5. Celtis reticulata Torr. Thick-leaved Hack- 

 berry. Fig. 1549. 



C. reticulata Torr. Ann. Lye. N. Y. i : 247. 1824. 



A small tree, up to 45 high, the bark rough with corky 

 warts and ridges sometimes i' high or more, the young 

 twigs pubescent or nearly glabrous, green, becoming 

 brown. Leaves thick, ovate, 3' long or less, strongly re- 

 ticulate-veined, acute, scabrous or nearly smooth above, 

 pubescent beneath, entire or serrate, the stout petioles 

 2"-$" long ; drupe globular, red, 4"-6" in diameter, on 

 peduncles usually longer than the petioles. 



Along rivers in rocky or gravelly soil, Kansas to Texas, Colo- 

 rado, Nevada and southern California. Reported to extend 

 into Lower California. May. 



Family 9. MORACEAE Lindl. Veg. Kingd. 266. 1847. 

 MULBERRY FAMILY. 



Trees or shrubs with milky sap, alternate petioled stipulate leaves, the stipules 

 fugacious, and small monoecious or dioecious axillary clustered flowers, or the 

 pistillate flowers solitary in some exotic genera. Calyx mostly 4~5-parted, becom- 

 ing fleshy in fruit, inferior. Petals none. Staminate flowers, spicate or capitate, 

 the stamens as many as the calyx-segments. Filaments inflexed in the bud. Pis- 

 tillate flowers capitate or spicate. Ovary superior, i-celled in our genera. Ovule 

 solitary, pendulous, anatropous. Styles i or 2. Fruit mostly aggregate. Embryo 

 curved or spiral. 



About 55 genera and 1,000 species, natives of temperate and tropical regions. The largest genus 

 is Ficus, the Fig, of which there are over 600 known species. 



Staminate and pistillate flowers spiked ; leaves dentate or lobed. 

 Staminate flowers racemose or spiked ; pistillate capitate. 



Pistillate perianth deeply 4-cleft ; leaves entire. 



Pistillate perianth 3~4-toothed ; leaves various. 



1. Moms. 



2. To.vylon. 



3. Papyrius. 



I. 



MORUS (Tourn.) L. Sp. PI. 986. 1753. 



Trees or shrubs, with milky sap, alternate dentate and often lobed, 3-nerved leaves, fuga- 

 cious stipules, and small monoecious or dioecious flowers, in axillary ament-like spikes, the 

 pistillate spikes ripening into a succulent aggregate fruit. Staminate flowers with a 4-parted 

 perianth, its ovate segments somewhat imbricated, and 4 stamens, the filaments inflexed in 

 the bud, straightening and exserted in anthesis. Pistillate flowers with a 4-parted persistent 



