40 CLASS V. ORDER I. 



ffoustonia. Corol salvei'-form : capsule 2-cclled, '- 

 Yalved, 2-sceded. 



B. Flowers 1-petalled, superior. 



Mitchella. Calyx 4-toothrd : corols 2 on earhgernij 

 tubular : berry double, 4-seeded : stigmas 4. 



Cephalanthus. Inflorescence in a head : general calyx 

 none : proper calyx superior : corol funnel-form : recep- 

 tacle globular, hairy : seed solitary, oblong. 



Galium. Calyx 4-toothed : corol flat ; seeds 2, round- 

 ish- 



C. Flmcers 4-pdaUcd 9 superior. 



Cornus. Calyx 4-toothed : drupe with a 2-celled nut. 

 Some species have a 4-leaved involucre. 



Ludwigin. Calyx 4 -parted, the divisions long, perma- 

 nent : capsule 4-cornered, 4-celled, perforated at the top,, 

 many seeded (petal sometimes wanting.) 



* Convallaria, Cardaminc. 



ORDER II. DIGYNIA. 



TELamamdix. Involucre 3-leaved : perianth 4-leavcd : 

 petals 4, very long, linear : nut 2-celled, 4-horned. 



* Cuscuta, Gentiana. 



ORDER IV. TETRAGTNIA. 



JPatamogeton. Calyx o : petals 4 : stylo o : seeds 4, 



CLASS V. PENTANDRIA. 



ORDER I. MONOGYNIA. 



A. Flowers 1-petallcd, inferior ; having 4 naked seeds* 

 Rough-leaved plants. 



Lithotyermum. Calyx 5-parted : corol funnel-forai, 

 with an open throat : seeds ovate, pointed, stoney : sta- 

 mens and pistils inclosed 



Cynoglossiim. Calyx 5-partcd : corol funnel-form, 

 Taulted, throat closed : seeds depressed, afb'xcd to the 

 side of the style. 



Myosoiis. *Calyx half-5-cleft : corol salver-form, curv- 

 ed, 5-cleft, vaulted, throat closed, the lobes slightly emaiv 

 ginate : seeds smooth or prickly. 



Borago. Corol wheel -form, the throat closed with ra.ys 

 surrounding the stamens. 



