A^sarum.'] 



LXXV. ARISTOLOCHIACE^. 



373 



2. T. * humile Yahl (erect B.) ; stems erect branched from the 

 base, leaves linear 1 -nerved fleshy, racemes spicate, flowers 

 nearly sessile trlbracteated. 



Near Dawlisb, Devonshire; Mr. C. C Bahington. %. 7, 8. 

 We have seen no British specimen of this species ; Vahl's plant was 

 obtained from the north of Africa, and it is most unlikely to be in- 

 digenous to England. Fruity according to the descriptions given, 

 similar to the last, but more reticulated. 



Orb. LXXV. ARISTOLOCPIIACEiE Juss. 



4 



It 



LJ^I 



\ 



Perianth below adnate with the ovary, above free, campa- 

 nulate or tubular, with an usually irregularly lobed and often 

 dilated limb. Stamens 6 — 10 or 12, epigynous. Ovary 3 — 6- 

 celled : ovules numerous. Style simple. Stigma rayed. Fruit 

 3— 6 -celled, many-seeded. Albumen fleshy, with the minute 

 enibryo at its base. — Herbs or shrubs, often climbing. Leaves 

 alternate. Wood without concentric zones, — Active emmena- 

 gogues. 



h 



1. AiiiSTOLOCHiA. Perianth tubular, very oblique : anthers 6, sessile on 



the style. 



2. AsARUM, Perianth canipanulate, equal, 3-cleft. Stamens 12. 





i 



t-' 



I 



.K 





i¥ 



1. Aristolochia Linn. Birthwort. 



Perianth tubular, often swelling at 

 dilated on one side. 



the base, the mouth 



Anthers 6,^ sessile on the shcrt stijle . - j^*f c^<^^ 

 Stigma with 6 lobes. Capsule 6-celled, — Name originating in 

 its supposed medicinal virtues. ° . 



1. A. ^ Clematitis L. (common B.); creeping, stem erect 

 simple, leaves heart-shaped stalked glabrous, flowers aggregated 

 upright, lip oblong shortly acuminate. JS. B. t. 398.°'' 



6 



Naturalized among old ruins in the E. and S. of Encrland. 

 -9. " ■ ' 



Flowers pale yellow, swollen at the base; the swollen part 



covered on the inside with stiff hairs pointing downwards. When the 



flower is expanded it is not uncommon for a little insect (Tipula 



pennicornis) to enter it, the stifF hairs preventing its egress until 



It has brushed off the pollen from the anthers upon the stigma: the 



perianth then withers, the hairs become flaccid, and the insect makes 

 Its escape. 



2. A^sARUM Limu Asarabacca. 



Perianth campanulate, 3-cleft. 

 the germen. 



Stam. 12, from the top of 



Stigma with 6 lobes. Caps. 6-celled.— Named 



^ 



