URTICACE&. 289 



{Fruit dry Ulmus. 

 Fruit a berry-like drupe Celtis. 

 Fruit like a blackberry Morus, 



URTICACE^. . 



Tall twiners Humulus. 



Herbs- 



Style one Urtica. 



Styles two, long Cannabis, 



1. Morus. Flowers monoecious or dioecious, the different kinds 

 in separate spikes. Calyx 4-parted. Stamens 4. Styles 2. Achenia 

 ovate, contained within the fleshy calyx, forming a juicy, berry-like 

 fruit. Trees. 



M. RUBRA (Red Mulberry), Leaves rough-pubescent beneath, cordate 

 or rounded at base, acuminate, entire, 3 to several-lobed ; flowers small, often 

 dioecious ; fruit dark red, sweetish. May. 



2. Cannabis. Flowers dioecious. Barren flowers in axillary ra- 

 cemes or panicles ; sepals 5 ; stamens 5. Fertile flowers spicate, clus- 

 tered ; calyx of I entire sepal inclosing the ovary. Herbs. 



C. SATIVA (Hemp}. Stem erect, tall, branching, rough ; leaves oppo- 

 site ; upper ones alternate ; all digitately parted ; leaflets lanceolate or linear- 

 lanceolate, coarsely serrate, dark green above, paler beneath ; flowers green ; 

 barren in terminal panicles, fertile in spikes. Weed-like plant, 4-6 feet high. 

 June. 



3. Humulus. Flowers dioecious ; barren in axillary panicles ; se- 

 pals 5 ; stamens 5 ; fertile in axillary spikes or aments ; bracts leafy, 

 imbricated. Achenia invested in the persistent, enlarged calyx, form- 

 ing a strobile, y. 



H. LUPULUS (Hop). Stem twining with the sun, rough backward with 

 reflexed prickles ; leaves opposite, cordate, 3-s-lobed or undivided ; stipules 

 ovate, persistent ; barren flowers very abundant, greenish, in axillary pani- 

 cles ; fertile in large strobiles or cones. July. 



4. Urtica. Flowers monoecious or dioecious. Calyx mostly of 4 

 sepals. Stamens 4. Stigma sessile, globular. Achenium compressed, 

 smooth, invested in the calyx. Stinging herbs. 



U. DIOICA (Nettle}. Stem erect, branching, very hispid and stinging, 

 obtusely 4-angled ; leaves opposite, ovate ; cordate at base ; flowers monoe- 

 cious or dioecious, in branching, panicled spikes. A stinging weed, 2-4 feet 

 high. July- August. 



5. Ulmus. Flowers perfect, rarely polygamous. Calyx campanu- 

 late, 4-g-cleft. Stamens 4-9. Styles 2. Ovaries flat. Fruit a flat 

 samara with a winged margin, by abortion i-celled, i-seeded. Trees. 



i. U. AMERICANA (Elm}. Young branches nearly smooth ; leaves ob- 

 long-obovate, doubly serrate, smooth above, pubescent beneath ; flowers 



