TETRANDRIA MONOGYNIA. 



PARIETARIA. Monoicously polygamous: Flowers in axillary in- 



volucrate clusters. Calyx 4-parted, persistent. Stigma pencil-tufted. 



Fruit a polished akene, or nut. ORD. XCVII. URTICACEAE. p. 289. 



[Euonymus atropurpureus. ORD. XXX. CELASTRACEAE. p. 48.] 



[Orontiitm aquaticum. ORD. XCIX. ARACEAE. p. 299.] 



[Smilacina bifolia. ORD. CXI, LILIACEAE. p. 323.] 



Order 2. Digynia. 



HAMAMELIS. Flowers clustered in threes, in small scale-like 3- 

 leaved involucres. Calyx 4-parted, with 2 or 3 bractlets at base. 

 Petals 4, long and linear. Capsule woody, 2-celled, 2-seeded, open- 

 ing at summit. ORD. XLIII. HAMAMELACEAE. p. 98. 



[Galium. ORD. XLVIII. RUBIACEAE. p. 116.] 



[Cuscuta epilinum. ORD. LXIX. CONVOLVULACEAE. p. 223.] 



[Gentiana crinita. ORD. LXXI. GENTIANACEAE. p. 231.] 



Order 4. Tetragynia. 



ILEX. Dioicously polygamous : Calyx 4- or 5-toothed, persistent. 

 Corolla subrotate, of 4 or 5 nearly distinct petals. Stamens alternat- 

 ing with the petals. Berry 4- or 5-seeded. ORD. LV. AQUIFOLI- 

 ACEAE. p. 175. 



POTAMOGETON. Flowers on a spadix-like spike : Sepals 4. Corolla 

 none. Ovaries 4, becoming fleshy, or coriaceous drupelets. ORD. 

 CII. NAIADACEAE. p. 303. 



CLASS V. PENTAtfDRIA. 

 Order 1. Monogynia. 



A. FLOWERS COMPLETE. 1. Ovary superior. 

 a. Corolla monopdalous. f Nutlets 4, apparently naked. 



* Nutlets fixed to tlie bottom of the calyb. 



MERTENSIA. Corolla trumpet-form, much longer than the 5-parted 

 calyx. Nutlets roundish-ovoid, smooth, rather fleshy. ORD. LXVI. 



BORAGINACEAE. p. 216. 



LITHOSPERMUM. Corolla funnel-form, or salver-form, with rounded 

 lobes; throat open. Style included. Nutlets ovoid, rugose or smooth, 

 bony. ORD. LXVI. BORAGINACEAE. p. 215. 



ONOSMODIUM. Corolla tubular-campanulate, with 5 acute, erect 

 lobes ; throat open. Stamens included. Style much exserted. Nutlets 

 ovoid, smooth and shining. ORD. LXVI. BORAGINACEAE. p. 215. 



ECHIUM. Corolla irregular, subcampanulate, obliquely 5-lobed; 

 throat open. Stamens mostly exserted. Nutlets tuberculate or 

 wrinkled. ORD. LXVI. BORAGINACEAE. p. 214. 



MYOSOTIS. Corolla salver-form ; throat closed by 5 short arching 

 scales. Stamens included. Nutlets smooth. ORD. LXVI. BORA- 

 GINACEAE. p. 216. 



SYMPHYTUM. Corolla tubular-campanulate; throat ventricose, closed 

 by 5 converging subulate-lanceolate scales. Nutlets gibbous, angular, 

 smooth. ORD. LXVI. BORAGINACEAE. p. 214. 



