XXXVl LINNiEAN ARRANGEMENT 



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

 Order L— MONOGYNIA.— 1 Pistil 



* Perianth double. Corolla 1-petalledy superior. 



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

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

 celled, 2-seeded (mostly 2-parted.) Receptacle globose, hairy. Rubiacece, 

 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 hmb of the calyx. Dipsa- 

 cacecB, p. 154. 



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

 wanting. Corolla rotate,'4-parted, (very rarely 3-parted). Fruit didymo us, 

 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. 

 Rubiacecs, 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. Rubiacece, 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, 

 Rubiacece, p. 150. 



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

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

 globose, 3-celled (one cell only bearing a perfect seed.) Caprifoliacea, 

 p. 149. 



** Perianth double (rarely single.^ CoroUa many-peialled, (rarely none,} 

 superior. 



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

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

 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. Sanguisorbacece, p. 106. 



*** Perianth double. Corolla \-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. Plantaginacecc, 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. 

 Gentianrdcece, p, 240. 



