MOXOPETALOUS EXOGENOUS PLANTS. 315 



ered, the slender pedicels equal cand spreading ; capsule 

 obcordate, rather longer than the calyx-teeth, the upper 

 half free. Stem slender, 6-10' long ; fioiuers and capsules 

 very small. — Marcy. 



*** CoroVa whe^lshaped, shorf^r than the calyx-lobes; flowers axillary and ter- 

 minal, single or clustered, sessile ; stamens and style very short ; cajysule in. 

 closed ill the calyx-tube ; pei-enrdal ; stipules f?inged. 



O. Boscii. Ste7}i smooth, diffuse, 4-angled; leaves 

 linear ; flowers single or 2-3 together ; corolla wliite or 

 purplish; capsule ovoid; stem 6'-10' long. 



♦♦** Corolla funnel-form. 5-lobed, longer than the calyx-teeth ; flowers axillary and 

 terminal, pentamerous ; capsule top-shaped, incuded in the calyx-tube; 

 stipules fringed ; annual. 



0. Halei. Stem diffuse, forking, weak; leaves oval- 

 oblongs acute at each end, somewhat fleshy; flowers soli- 

 tary, or in short 3-5-flowered cymes, white. 



MITREOLA, L. Mitrewort. 



Calyx 5-parted ; corolla short, 5-lobed, valvate in the 

 bud, the tube roundish, bearded in the throat; stamens 5, 

 included ; anthers ovate ; styles 2, short, united above ; 

 stigma capitate ; capsule 2-parted, mitre-shaped, many- 

 seeded, the two lobes opening on the inner face near the 

 apex; seeds oval, concave. — Smooth herbs, with opposite 

 leaves, and small white floiuers in terminal and axillary 

 cymes, with the simple branches recurved in the bud. 



M. PETIOLATA, Torr. and Gray. Stem branching; leaves 

 thin, oblong, acute, narrowed into a petiole. (Ophiorhiza 

 lanceolata. Ell.) Muddy banks. Stem 4-angled, l°-2° 

 high; leaves 2 -3' long ; annual. 



M. SESSiLiFOLiA, Torr. and Gray. Stem simple, 4-angled ; 

 leaves thick, ovate or roundish, strongly veined, sessile, 

 rough on the margins ; flowers and capsule very small. 

 (Ophiorhiza mitreola, Michx.) Varies with lanceolate 



