URTICACEAB 109 



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



Fam. 2. Cannabinaceae. 

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

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

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



Family i. URTICACEAE Reiclienb. Netti,e Family. 

 Plants armed with stinging hairs. 

 Leaves opposite : staminate flowers with 4 sepals and 4 stamens : achenes 



equilateral: style terminal. i. Urtica. 



I<eaves 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. 1 . U. dioica. 



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



1. Urtica dioica L. Stinging or Great Nettle. (IVIan. p. 342 i 

 I. F.y. 1263.) In waste places, N. S. to Minn., S. C. and Mo. Nat. from 

 "Biu.. — Pennsylvania : Northampton; Lancaster; Huntingdon; 

 Franklin ; Chester ; Delaware. 



2. Urtica gracilis Ait. Slender Nettle. (Man. p. 342 ; I. F. /. 

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

 Northampton ; I^ncaster ; Hdntingdon ; Erie ; Monroe ; Frank- 

 lin; Allegheny. 



2. URTICASTRUM Fabr. 



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

 p. 343 ; I. F. f. I26y.) In rich woods, N. S. to Minn., Fla. and Kans. — 

 Pennsylvania: Northampton; Lancaster; Huntingdon; Erie; 

 Franklin ; Monroe ; Delaware ; Allegheny. 



3. ADICIA Raf. 

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

 343 ; I. F. / 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. Boehmeria cylindrica (L.) Willd. False Nettle. (Man. p. 343 ; 

 I. F. y. 1269.) In moist soil, Quebec to Minn., Fla. and Kans. — Penn- 

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

 lin ; Chester ; Delaware. 



