298 70. ABISIOLOCHIACEiE, 



1. Thb'sitjm Linn. 



1. T. humifiismn (DC.) ; st. procumtent or ascending race- 

 mose, racemes branched or simple, fl.-atnLksas long as or longer 

 than the fl., fr. -stalks patent, angles of fr.-stalks and edges of 

 bracts and upper 1. denticulate-asperous, fr. oyal-oblong, 1. 1- 

 veined linear. — JR. xi. 542. T. linophyUum Sm. — Parasitical. 

 Root woody. St. nearly always- prostrate, spreading in a circle. 

 L. very slender ; veins usually obscure. Bracts 3, lower middle 

 ones exceeding flowers. Tube of perianth very short, open, 

 funnelahaped ; segm. triangular, spreading, a tooth on each side. 

 Fr. ovoid, longer than the persistent perianth which is usually 

 inflexed only at the end, strongly ribbed, slightly netted. — 

 Chalky and limestone (ooHte) hills. P. VI. VII. E. 



{•T. intermedium (Schrad.) ; St. more erect panicled, panicle 

 pyramidal, lowest branches longest, 1. linear-lanceolate 3- veined ; 

 may be a native of Britain.] 



[ T. humile (Vahl) ; racemes spiked,_^. nearly sessih, fr, strongly 

 ribbed and netted sessile crowned with the very short inflexed 

 perianth, I. fleshy linear 1 -veined. — i?. xi, 542.— ^Fr. 4 OB 5 -times 

 as longas the persistent inflexed perianth. Middle hract much 

 exceeding the flowers. — I gathered two specimens of this plant 

 somewhere near Dawlish in Devonshire in 1829, but it was 

 perhaps not indigenous. P. VII. VIII.] , E. 



Order LXX. AEISTOLOCHIACE^. 



Perianth adnate to the ovary below, tubular' above, with a 

 lobed dilated usiially irregular limb. Stam. 6 — 12, epigvnous. 

 Ovary 3 — 6-celled. Style simple ; stigma radiant. Ff. many- 

 seeded. Seed witji a minute embryo at the' base of fleshy albu- 

 men. — For fig. of genera see G. lf\ G. Monochl. 5D, 51. 



[1. Aristolochia. Perianth tubular, swelling at the base ; 

 mouth dilated on one side. Anth. 6, adnate^to the short 

 columnar style under the 6-lobed stigma. Caps. 6-celled.] 



2. AsAEUM. Perianth bellshaped, 3-fid. Stam. 12, inserted 

 at the base of the style. Anth. attached to the middle of 

 the filaments. Stigma 6-lobed. Caps. C-celled. 



I . Aeistolo'chia Linn. Birthwort. 



[1. A. Clematitis ,(L.) ; creeping, st. erect simple, 1. cordate 



stalked glabrous, fl. clustered. — St. 6. 16. — Fl. pale yellow. 



Established near old ruins. P. VII. ^'III.] . " E. 



