VALERIANACE^E, DIPSACE-E. 63 



whorls of 3. Easily recognized by the globular head of white 



flowers. 



4. MITCHEI/L.A, L. PARTRIDGE BERRY. 



M. repens, L. Common in dry woods. Leaves round-ovate, 

 shining, sometimes with whitish lines. 



5. HOUSTO'NIA, L. HousxoNlA. 



H, purpu'rea, L. Stems tufted, 3-6 inches high. Leaves 

 varying from roundish-ovate to lanceolate, 3-5-ribbed, sessile. 

 Woodlands. 



ORDER XLYII. VALERIANA'CEJE. (VALERIAN F.) 



Herbs with opposite exstipulate leaves, and small cymose 

 flowers. Calyx-tube adherent to the ovary, the latter 3 celled, 

 but only one of these fertile. Stamens 1-3, fewer than the lobes of 

 the corolla. Style slender. Stigmas 1-3. The only common 



genus is 



VAI^ERIA'NA, Tourn. VALERIAN. 



1. V. Sylvat'ica, Richards. ( V. dioica, var. uliginosa, Torr. 

 and Gray, in Macoun's Catalogue.) Not uncommon in cedar- 

 swamps. Root fibrous. Calyx-limb consisting of several bristles 

 rolled inwards in the flower, but expanding in fruit. Corolla gib- 

 bous at the base. Stamens 3. Root-leaves ovate or oblong, 

 entire ; stem-leaves pinnate, leaflets 5-11. Stem erect, striate, 

 1-2 feet high. 



2. V. ed'ulis, Nutt. Root spindle-shaped, large. Flowers in 

 a long and narrow interrupted panicle, nearly dioecious. Stem- 

 leaves deeply pinnatifid. Low grounds, western Ontario. 



ORDER XLVHI. DIPSA'CEJE. (TEASEL FAMILY.) 



Herbs with the flowers in heads, surrounded by a many-leaved 

 involucre, as in the next Family, but the stamens are distinct. 

 Leaves opposite. Represented in Canada by the genus 



DIP'SACUS, Tourn. TEASEL. 



D. sylves'tris, Mill. (WiLD TEASEL.) A stout coarse prickly 

 plant, not unlike a thistle in appearance. Flowers in oblong 

 very dense heads, bluish. Corolla 4- cleft. Stamens 4, on the 



