Genus i. 



MADDER FAMILY. 



6. Houstonia purpurea L. Large Houstonia. 

 Yenus'-pride. Fig. 3917. 



Houstonia purpurea L. Sp. PI. 105. 1753. 

 Hedyotis purpurea T. & G. FI. N. A. 2 : 40. 1841. 

 Oldenlandia purpurea A. Gray, Man. Ed. 2, 173. 1856. 

 Houstonia purpurea pubescens Britton, Mem. Torr. Club 4: 

 125. 1894. 



Perennial, stout, erect, tufted, branched or simp'.e, 

 glabrous or pubescent, 4-18' high. Leaves ovate or 

 ovate-lanceolate, sessile, or the lower ones short- 

 petioled, 3-5-nerved and pinnately veined, obtuse or 

 acute, -2 long, 3"-IS" wide, the margins often ciliate; 

 flowers in terminal cymose clusters ; pedicels l"-4" 

 long; corolla purple or lilac, funnelform, 3"-4" long, 

 the tube at least twice as long as the lobes ; capsule 

 compressed-globose, il" broad, somewhat didymous, its 

 upper half free and considerably shorter than the subu- 

 late-linear calyx-lobes. 



In open places, Maryland to Iowa, Kentucky, Missouri, 

 Georgia, Alabama and Mississippi, especially in the moun- 

 tains. May-Sept. 



7. Houstonia ciliolata Torr. Fringed Hous- 

 tonia. Fig. 3918. 



Houstonia ciliolata Torr. FI. N. U. S. 1 r 173. 1824. 

 Houstonia purpurea var. ciliolata A. Gray, Man. Ed. 5, 

 212. 1867. 



Perennial, tufted, erect or ascending, 4'-"' high. 

 Lower and basal leaves petioled, thick, i-nerved, obo- 

 vate or oblanceolate, obtuse, 6"-lo" long, their margins 

 conspicuously ciliate; stem leaves oblong or oblanceo- 

 late, sessile or nearly so ; flowers in corymbed cymes ; 

 pedicels filiform, i"-4" long; corolla funnelform, lilac 

 or pale purple, about 3" long, the lobes about one- 

 third the length of the tube; capsule little compressed, 

 obscurely didymous, l" wide, overtopped by the linear- 

 lanceolate calyx-lobes. 



On rocks and shores, Ontario to Minnesota, south to 

 Pennsylvania, West Virginia, Kentucky and Arkansas. 

 May- Aug. 



8. Houstonia longifolia Gaertn. Long- 

 leaved Houstonia. Fig. 3919. 



Houstonia longifolia Gaertn. Fruct. 1 : 226. pi. 49. f. S. 



1788. 

 Houstonia purpurea var. longifolia A. Gray, Man. Ed. 



5, 212. 1868. 



Perennial, usually tufted, erect, glabrous or pu- 

 berulent, 5-10' high. Basal leaves spatulate or ob- 

 lanceolate, obtuse, not ciliate, very short-petioled; 

 stem leaves linear or linear-objong, acute or obtuse, 

 I-nerved, 6"-l2" long, i"-2i" wide; flowers in 

 corymbed cymes; calyx-lobes subulate; corolla pale 

 purple or nearly white, 2V-3" long, its lobes about 

 one-third the length of the tube; capsule little com- 

 pressed, globose, ovoid, about 1" in diameter, its upper 

 half free and much exceeded by the subulate calyx- 

 lobes. 



In dry open places, Maine and Ontario to Manitoba, 

 Saskatchewan, Georgia, Mississippi and Missouri. May- 

 Sept. 



