URTICACEAE 109 



** Styles or stigmas 2 : ovule pendulous : filaments erect in the bud. 



Fam. 2. Cannabinaceae. 

 b. Flowers on the outside or inside of a receptacle : fruits forniiiig syncarps : 

 sepals accrescent, enveloping the achenes. Fam. 3. Moraceak. 

 B. Fruit a samara or a drupe, sometimes nut-like. Fam. 4. Ulmaceae. 



Famii^y I. URTICACEAE Reichenb. NeTTi.e Famii^y. 



Plants armed with stinging hairs. 



L,eaves opposite: staminate flowers with 4 sepals and 4 stamens: achenes 



equilateral: style terminal. i. Urtica. 



Leaves alternate : staminate flowers with 5 sepals and 5 stamens : achene 

 oblique: style lateral. 2. UrticaSTRUM. 



Plants glabrous, or at least destitute of stinging hairs. 

 Flower-clusters not involucrate : leaves mostly opposite. 

 Flower-clusters in axillary often clustered cymes : achene not included. 



3. Adicea. 

 Flower-clusters spicate on slender mostly simple branches : ache 



eluded. 4. BOEHMERIA. 



Flower-clusters involucrate : leaves alternate. 5. Parietaria. 



1. URTICA L 



Stems copiously bristly : leaf-blades of an ovate type. i. U. dioica. 



Stems sparingly bristly : leaf-blades of a lanceolate type. 2. U. gracilis. 



1. Urtica dioica L. Stinging or Great NeTTI,e. (Man. p 342; 

 I. F./. i26j.) In waste places, N. S. toMinu., S. C. and Mo. Nat. from 

 Eu. — Pennsylvania: Northampton; Lancaster; Huntingdon; 

 Franklin ; Chester ; Delaware. 



2. Urtica gracilis Ait. Slknder Nettle. (Man. p. 342; I. F. y. 

 1264.) In dry soil, N. S. to B. C, N. C. La. and Kans. — Pennsylvania : 

 Northampton ; Lancaster ; Huntingdon ; Erie ; Monroe ; Frank- 

 lin; Allegheny. 



2. URTICASTRUM Fabr. 



1. Urticastrum divaricatum (L) Kuntze. Wood-netTlE. (Man. 

 p. 343 \ I. T?. /. /26y.) In rich woods, N. S. to Minn., Fla. and Kans. — 

 Pennsylvania : Northampton ; Lancaster ; Huntingdon ; Erie ; 

 Franklin ; Monroe ; Delaware ; Allegheny. 



3. ADICIA Raf. 



1. Adicia punula (L. ) Raf. ClEarweed. Richweed. (Man. p. 

 343 ; I. F. y! 1268.) In moist, wet places, N. B. to Ont., Minn., La. and 

 Kans. Also in Japan. — Pennsylvania: Northampton; York; Frank- 

 lin ; Huntingdon ; Erie ; Chester ; Lancaster ; Delaware ; 

 Allegheny. 



4. BOEHMERIA Jacq. 



1. Boehmeiia cylindrica (L.) Willd. False Nettle. (Man. p. 343 ; 

 I. F. y. f26p.) In moist soil, Quebec to Minn., Fla. and Kans. — Pentt- 

 sylvania : Northampton ; Bucks ; Lancaster ; Columbia ; Frank- 

 lin ; Chester ; Delaware. 



