

RUBUCE^E. 161 



C. occidentalis Linn. : leaves opposite or ternate, ovate or oval, acu- 

 minate ; peduncles much larger than the head of flowers. 



HAB. Borders of ponds and streams. Can. to Flor. W. to Miss. 

 July, Aug. !?. Shrub 4 5 feet high, branched. Leaves 

 ovate-oblong, petioled, smooth. Flowers in heads, white. 



Button Bush. 



4. DIODIA. Linn. 



Calyx with the tube ovate or obovate, often 8-nerved ; 2 4- 

 toothed. Carol funnel-form, 4-lobed. Stamens 4, exserted 

 or included. Style bifid or undivided. Fruit crowned with 

 the calyx, 2-celled, bipartile ; carpels 1-seeded. 



Tetrandria. Monogynia. 



1. D. teres Walt. : stem procumbent, diffuse, terete, hairy ; leaves 

 linear-lanceolate, nearly smooth, margin and keel serrulate ; stipules 

 with numerous long bristles ; flowers axillary, solitary, alternate ; 

 corol bearded within ; fruit ovate, pubescent, crowned by the 4-lobed 

 calyx. Speryiacoce diodina Mich, 



HAB. Sandy fields. N. J. to Car. Aug. %j.Stem 68 inches 

 long. Flowers opposite, often clustered, white or pale purple. 



2. D. virginica Linn. ,- smooth ; stem procumbent, nearly terete ; leaves 

 lanceolate, opposite, acute, scabrous on the margin ; corol nearly 

 smooth within ; fruit oblong, smooth, crowned by the 2-lobed calyx. 



HAB. Damp soils. Md. to Car. Sept. If. Stem smooth. 

 slender, purple. Floioers white, solitary, opposite, 



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

 wanting. C0r0/4-parted, rotate, (very rarely 3-parted.) Sta- 

 mens short. Styles 2, short. Fiidt didymous, roundish, 

 rarely oblong, Tetrandria. Monogynia. 



* Fruit smooth. Flowers yellow. 



1. G. verum Linn. : leaves about 8 in a whorl, linear, grooved, entire ; 

 flowers in dense panicles, 



HAB. Pastures. N. S. June, July. U.Stem erect, 918 

 inches high, slender, branched. Leaves linear, deflexed, round- 

 ish. Flowers yellow. Introduced ? Yellow Bedstraw. 



** Fruit smooth. Flowers white. 



2. G. trifidum Linn. : stem procumbent, scabrous downward ; leaves 

 4 6 in a whorl, linear, obtuse, scabrous on the margin and midrib ; 

 peduncles smooth, spreading, 3-clefl ; corol 3 4-cleft. G. claytoni 

 Mick. 



HAB. Swamps and wet fields. Can. to Car. N. to Arc. Amer. 

 June, July. If. Stems procumbent and assurgent, much branch- 



14* 



