Division III.— Apetalous Exogenous 

 Plants. 



Floral envelope consisting of a calyx only, or altogether wanting. 



98. BIETHWORT FAMILY. Order, Akistolochiace^. 



Heris or woody vines, with alternate petioled mostly cor- 

 date and entire leaves, and solitary peduncled dull- colored 

 Jlotversj calyx adherent to the 6-celled ovary, tubular, 

 valvate in the bud; stamens 6-12, more or less united with 

 the styles ; anthers adnate, extrorse ; fruit 6-celled, few- 

 many-seeded ; seed anatropous ; embryo minute, at the base 

 of fleshy albumen. 



ASAEUM, Tourn. Asarabacca. 



(7a?ya^ regular, 3-lobed; stamens 12, the filaments partly 

 united with the style, and usually prolonged beyond the 

 anthers ; capside fleshy, globose, opening irregularly. — Aro- 

 matic perennial herbs, with creeping stems, long-petioled 

 cordate or kidney-shaped leaves, and axillary peduncled 

 flowers. 



The Asarabacca grows in South-eastern Texas. Variety 

 not described by the friend who found it. 



99. FOUR-O'CLOCK FAMILY. Order, Nyctaginace^. 



Herbs or shrubs, with tumid joints ; leaves mostly oppo- 

 site, simple, petioled, without stipules ; calyx colored and 

 resembling a corolla, tubular-bell-shaped or funnel-shaped, 

 free from the 1-celled and 1-ovuled ovary, plaited in the 

 ^ud, cpiitracted ii; the middle, with the upper portion de- 



