GENUS i. 



MADDER FAMILY. 



6. Houstonia purpurea L. Large Houstonia. 

 Venus'-pride. Fig. 3917. 



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

 Hedyotis purpurea T. & G. Fl. 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 simple, 

 glabrous or pubescent, 4'-i8' 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 i"-4" 

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

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

 compressed-globose, ii" 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. Fl. N. U. S. i : 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"-io" 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, \\" 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. i : 226. pi. 49. f. 8. 



1788. 

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



S, 212. 1868. 



Perennial, usually tufted, erect, glabrous or pu- 

 berulent, s'-io' high. Basal leaves spatulate or ob- 

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

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

 i-nerved, 6"- 12" long, i"-2$" wide ; flowers in 

 corymbed cymes ; calyx-lobes subulate ; corolla pale 

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

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

 pressed, globose, ovoid, about i" 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. 



