208 ambrosiacejE. — 46. campanulacejE. 



Anomalous Genus. Order AMBROSIACE^ Link. 

 47. Xanthium Linn. 



[1. X. strwmarium (L.) ; st. without spines, lower 1. heart- 

 shaped 3-lobed at the base coarsely dentate, beaks of the fr. 2 

 straight. — E. B. 2544. — Involucre of the fr. oval, downy. — Eich 

 waste land, scarcely naturalized. A. VIII. IX.] 



Order XL VI. CAMPANULACE^. 



Cal. superior, 5-fid or entire. Cor. monopetalous, inserted on 

 the calyx, 5-lobed, regular or irregular. Stam. inserted with the 

 cor. and alternate with its lobes ; anth. distinct or cohering, 

 2-celled, opening longitudinally. Fr. dry, capsular, opening by 

 lateral fissures or valves at the apex, many-seeded. Embryo 

 straight in the axis of fleshy albumen. 



Tribe I. LOBELIEJS. Odd segment of the calyx anterior. 

 Cor. iiTegular. Anth. cohering. Style glabrous with a fringe 

 of hairs below the stigma. 



1. Lobelia. Cal. 5-fid, Cor. irregular; tube split to the 

 base on the upper side ; limb 2-lipped, 5-parted. Anth. 5, 

 cohering. Stigma blunt, surrounded by a cupshaped fringe. 

 Caps. 2 — 3-celled, opening at the end by 2 — 3 valves. 



Tr. II. CAMPANULE^. Odd segment of the calyx posterior. 

 Cor. regular. Anth. usually free. Style pubescent. 



2. Jasione. Cal. 6-fid. Cor. rotate with 5 long linear seg- 

 ments. Anth. cohering at their base. Style hairy, bifid. 

 Caps. 2-celled, opening at the end by minute teeth. 



3. Phyteuma. Cal. 5-parted. Cor. rotate with 5 long linear 

 segments. Anth. free ; filaments dilated at the base. Style 

 haiiy, 2 — 3-fid. Caps. 2 — 3-celled, bursting at the sides. 



4. Campanula. Cal. 5-parted. Cor. mostly bell-shaped 

 with 5 broad and shallow segments. Anth. free ; filaments 

 dilated at the base. Stigma 3 — 5-fid. Caps, not elongated, 

 3 — 5 -celled, opening by lateral pores outside the segments of 

 the calyx. 



5. Specularia. Cor. rotate. Caps, linear-oblong, prisma- 

 tical, opening by lateral pores between the segments of the 

 calyx. Otherwise like Campanula. 



6. Wahlbnbergia. Caps, half superior, 3-celled, opening 

 by 3--5 valves within the segments of the calyx. Other- 

 wise like Campanula. 



