302 MONOPETALEZ—HYPOCOROLLES: 
to possess any purgative properties. Ipomea orizabensis, I. tu- — 
berosa and J. cathartica possess properties similar to Jalap. 
The Mechoacan root, used as a gentle purgative in Mexico, is 
considered to belong to some species of Ipomea. Pharbitis 
nil (Convolvulus nil), has a cathartic power in the seeds, 
from which it is used in India. : 
Officinal Planis. 
Convolvulus Jalapa (or Ipomea Jalapa.) 
Convolvulus Scammonia. 
ORDER LXII. 
BIGNONIACE#, 
An order of little interest, except for the beauty of their 
flowers; the Trumpet flower (Bignonia chica) is an example. 
The corolla is irregular, the capsule 2-celled with a central 
many-seeded placenta, and seeds winged. 
ORDER LXIIL 
GENTIANZ, 
Curation zeae (rarely shrubs) with opposite entire 
ribbed, often sessile leaves ; flowers axillary or terminal ; 
calyx monosepalous, usually of 5 divisions, persistent ; co- 
_ rolla regular, tubular, usually of 5 lobes, or the same num- 
= _ ber as those of the calyx, estivation twisted and imbricated, 
"persistent ; stamens generally 5, inserted upon the corolla, 
__ and alternate with its segments ; ovary simple, 1- or 2-celled, 
many-seeded ; style simple or bifid; stigma 2-lobed, or 2 
stigmas ; pericarp a 1- or 2celled, many-seeded berry, oe 4 
; — 2-valved, with a central = when . 
