VALERIANACE^. iOl 



5. HOIISTO'NIA, L. HOUSTONIA. 



1. H. pUFpu'rea, L. Stems tufted, 3-6 inches high. 

 Leaves varying from roundish- ovate to lanceolate, 3-5- 

 ribbed, sessile. — Woodlands. 



Vap. longifo'lia, Gray, has thinner oblong-lanceolate to 

 linear leaves, and is lower. — Chiefly N. W. 



2. H. eserulea, L. (Bluets. Innocence.) A slendei- 

 herb with erect stems. A single flower on each slender 

 peduncle. Leaves oblong-spathulate. Corolla light blue to 

 nearly white, with a yellowish eye and a long tube. — Moist 

 grassy places, Atl. Prov. 



Order XLVIII. VALERIANA'CEiE. (Valerian P.) 

 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 



VALBKIA'NA. Tourn. Valerian. 

 1- V. sylvat'iea. Banks. Not uncommon in cedar-swamps. 

 Boot fibrous. Calyx-limb consisting of several bristles rolled 

 inwards in the flower, but expanding in fruit. Corolla 

 gibbous 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. Boot spindle-ikiped, large. Flowers 

 in a long and narrow interrupted panicle, nearly dioecious. 

 Stem-leaves deeply pinnatifid. — Low grounds, western 

 Ontario. 



Order XLIX. DIPSA'CRS!. (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 



