ORDER XCVIII.— NYCTAGmACEiE. 483 



MONOCHLAMYD'EJE. 



Flowers with a simple perianth. 



Order XCVIIL— NYCTAGINA'CE.^. {Marvel of Peru 

 Family.) 



Perianth tubular, somewhat colored, aestivation plaited, be- 

 coming indurated at the base. Stamens definite, hypogynous. 

 Ovary superior; ovule 1, erect. Style 1. Fruit inclosed in 

 the tube of the calyx. Seed with its testa coherent with the 

 utricle. Cotyledons foliaceous. Leaves opposite, usually un- 

 equal. 



Genus L— BOERHAA'VIA. L. 3—1. 



(Named after Boerhaave, a celebrated Dutch physician, and friend and patron of 

 Linnteus.) 



Perianth campanulate, plaited. Stam^'ns 2, or more, at- 

 tached to the base of the perianth. Style 1. Stigma capitate. 

 Seed 1. 



1. B. erec'ta, (L.) Stem erect, trichotomous, glabrous at the sum- 

 mit, jointed. Leaves opposite, ovate, undulate, veins purple on the un- 

 der surface. Floviers in corymbose panicles. Perianth seated on a 

 minute glandular ring, white, tinged with purple. Stamens 2 — 3, 

 longer than the perianth. — 0. June — Sept. Sandy soils. 



Genus II.— ALLIO'NIA. L. 4—1. 

 (In honor of Allioni, an Italian botanist) 



Involucre oblong, simple, 3-flowered. Perianth longer than 

 the involucre, irregular. Stamens 4. Style 1. 



1, A, al'bida, (Sweet.) Stem erect, quadrangular, furrowed, sprin- 

 kled with a glandular pubescence. Leaves opposite, oblong-laiioeolate, 

 irregular, often slightly panduriform, scabrous along the niarifiiis. /n- 

 volucre 5 cleh, hairy. Seed naked, angled, almost hispid. — Q. April 

 — May. Middle Car. and Geo. 



Genus III.— OXYBAPH'US. Vahl. 3—1. 

 (From axua, acid, and baphe, dyers' color.) 



Involucre 5-cleft, 1 — 3-flowered. Pcriyoninm tubular, limb 

 plicate, campanulate. Stamens 3, united. Fruit ovate, ribbed. 



1. O angustifo'lius, (Sweet.) Stem herbaceous, erect, glabrou*. 

 Leaves linear-lanceolate, sessile, obtuse at the base, acute at the apex. 

 Flowers in lax panicles. — White. U . 



