372 KYCTAGINACE^. (fOUU-o'cLOCK FAMILY.) 



twininc: Iicrbs or shrabs. Leaves alternate, cordate at tlic base. Flowers long- 

 pcduncled, axillary, or near the base of the stem. 



* Low herbs. 

 1- A. Serpentaria, L. Stems single or clustered, pubescent, zigzag and 

 leafv above ; leaves short-petiolcd, varying from ovate to linear-lanceolate, cor- 

 date or hastate at the base ; flowers near the base of the stem, on braeted spread- 

 ing peduncles ; calyx tortuous, 3-lobed, dull purple. (A. hastata, Null.) — Shady 

 woods, Florida to Mississippi, and northward. June -Aug. — Stem 8'- 12' 

 high. Leaves 2' -4' long. Calyx shaped like the letter S. 



* * ]Voodi/ vines: capsule ohlotirj, six-arujled, 3' -4' lotifj. 



2. A. Sipho, L'Her. Stem smoothish ; leaves large, orhicular-cordntp, 

 slightly pubescent beneath ; peduncles slender, solitary, with a roundish clasping 

 bract near the base ; calyx curving upward, with the broad spreading brownish- 

 purple border obscurely 3-lobed. — Rich woods along the mountains, Georgia, 

 and northward. May. — Stem climbing high. Leaves C- 12' broad. Calyx 

 shaped like a Dutch pipe, 1 j' long. 



3. A. tomentosa, Sims. Hoary-pubcsccnt ; leaves cordate ; peduncles 

 opposite flic leaves, bractless, woolly ; calyx bent in the middle, the greenish 

 rugose imequally 3-lobed border reflexed, thickened and dark brown at the 

 nearly closed throat. — River-banks, Florida, to the mountains of North Caro- 

 lina, and westward. May. — Stem very long. Leaves 3' -5' long. Calyx 

 similar in shape to the preceding, but smaller- 



OuoKR 100. NYCTAGT1VACE;E. (Four-o'clock Family.) 



Herbs or slinibs with tumid joints. Leaves mostly opposite, simple, 

 pptioled, without stipules. — Calyx colored and resembling a corolla, 

 tubular-bell-shai)od or funnel-shaped, free from the 1-eelled and 1-ovuled 

 ovary, plaited in the bud, contracted in the middle, with the upper por- 

 tion deciduous. Stamens 1 - several, liypogynous : anthei-s 2-celled, round- 

 ish. Ovule erect. Style simple : stigma simple or branched. Acheniiun 

 enclosed in the indurated, mostly ribbed, often glandular base of the 

 i^alyx. Knibryo coiled or folded around copious mealy albumen. Cotyle- 

 dons leafy, lladicle inferior. 



SynopsLs. 



* FInwpra surrounded liy a c.ilyx like involucre. 



1. OXYn.\PHUS. involucre open, membraniu-cous, 5 loUcd. Herbs. 



• * Flowers without an Involucre. 



2. T^OFRIIAAVTA. Flowers perfect. Embryo coiled Herbs, 

 a. I'ISONIA. Jflowcrs dioecious. Fmbryo straiglit. Shrubs. 



1. OXYBAPHUS, Vahl. 



Flowers p^vfc-t. 1 - ."i in a cluster, siuT<)uii(i<'(i by an open cup-shaped 5-Iol)od 

 involucre. Caiyx-lulio very short; the bell-shaped limi) S-lobed, deciduous. 



