XXXVI LINNJEAN ARRANGEMENT 



CLASS IV. TETRANDRIA. 4 Stamens, equal in height. 

 ORDER L MONOGYNIA. 1 Pistil. 



* Perianth double. Corolla l-petalkd, superior. 



CEPHALANTHUS. Flowers in a globose head. Calyx small, angular, in- 

 versely pyramidal, 4-cIeft. Corolla tubular, slender, 4-cleft. Capsule 2- 

 celled, 2-seeded (mostlv 2-parted.) Receptacle globose, hairy. Rubiacetz, 

 p. 150. 



DIPSACUS. Flowers collected in an ovoid or roundish head. Common 

 calyx (involucre) foliaceous, many-leaved ; proper superior, of one leaf. 

 Corolla tubular, 4-cleft. Fruit crowned by the limb of the calyx. Dipsa- 

 cacece, p. 154. 



GALIUM. Calyx with the tube ovate-globose or oblong ; limb nearly 

 wanting. Corolla rotate, 4-parted, (very rarely 3-parted). Fruit didymous, 

 roundish, rarely oblong. Rubiacece, p. 151. 



DIODIA. Calyx with the tube ovate or obovate, 2 4-toothed. Corolla 

 funnel-form, 4-lobed. Fruit crowned with the calyx, 2-celled, bipartite. 

 Rubiacctz, p. 151. 



HEDYOTIS. Calyx with the tube ovate, the limb 4-toothed. Corolla fun- 

 nel-form, salver-form or rotate, 4-parted. Capsule ovoid or globose, 2-celled, 

 opening transversely at the top, many-seeded. Rubiacete, p. 149. 



MITCHELLA. Flowers in pairs with their ovaries united. Calyx 4- 

 toothed. Corolla funnel-form; tube cylindric; limb 4-parted, spreading, 

 villous on the inner side. Stigma 4-cleft. Berry didymous, 4-seeded. 

 RubiacefE, p. 150. 



LINNJEA. Calyx with the tube ovate; limb 5-parted. Corolla turbi- 

 nate, subcamnanulate, 5-lobed. Stigma globose. Berry dry, small, ovoid- 

 globose, 3-celied (one cell only bearing a perfect seed.) Caprifoliacecs, 

 p. 149. 



** Perianth double (rarely single.') Corolla many-petalled, (rarely none,) 

 superior. 



6oRNtis. Calyx adherent to the ovary; the limb minute, 4-toothed. 

 Petals 4, oblong, spreading. Drupe with the cells not united. Cornacece, 

 p. 142. 



ISNARDIA. Calyx with the tube ovate or sub-cylindric, short, adhering 

 to the ovary ; limb 4-parted. Petals 4, often minute or wanting. Capsule 

 short, 4-sided, 4-valved, many-seeded. Onagracece, p. 110. 



SANGUISORBA. Flowers perfect or rarely polygamous. Calyx 4-cleft, 

 with 2 3 scales*at base externally. Petals none. Achenium dry, included 

 in the hardened 4-winged calyx tube. Sanguisorbace<z, p. 106. 



*** Perianth double. Corolla, I-petalled, inferior. 



PLANTAGO. Calyx 4- (rarely 3)- parted. Corolla 4-cleft; border re- 

 flexed. Stamens mostly very long. Capsule 2 4-celled, opening trans- 

 versely. Plantaginacea, p. 293. 



CENTAURELLA. Calyx 4-parted, appressed. Corolla subcampanulate, 

 4-parted. Stigma thick, glandulous and partly bifid. Capsule 1-celled, 

 2-valved, many-seeded, surrounded by the persistent calyx and corolla. 

 Gentianace<K) p. 240. 



