214 



RUBIACEAE. 



[Vol. III. 



5. Houstonia purpurea L, 



Large Houstonia. (Fig. 3397.) 



llousloiiia />urf>iirea L. Sp. PI. loj. 1753. 

 Hedvolis put t^uica T. & G. Fl. N. A. 1: 40. 1841. 

 Oldenlandia purpurea \. Gray, Man. Ed. 2, 173. 1S56. 



Perennial, stout, erect, tufteil, branched or .simple, 

 glabrous or soniewhat pubescent, 4'-i8' high. Leaves 

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

 short-petioled, 3-5-nerved and pinnately veined, ob- 

 tuse or acute, yi'-2' long, 3"-i5" wide, the margins 

 often ciliate; flowers in terminal cymose clusters; pedi- 

 cels \"~\" long; corolla purple or lilac, funnelform, 

 3"-4" long, the tube at least twice as long as the lobes; 

 capsule compressed-globose, i/j" broad, somewhat 

 didymous, its upper half free and considerably shorter 

 than the subulate-linear calyx-lobes. 



In open places, Marj'land to Kentucky, Georgia and 

 Alabama, especially in the mountains. Maj'-Sept. 

 Houstonia purpiirea pubescens Britten, Mem. Torr. Club, 4: 

 125. 1894. 



Whole plant densely pubescent. Virginia. 

 Houstonia purpiirea calycosa A. Gray, Syn. Flor. i: Parts, 

 26. 1878. 



Leaves lanceolate or narrower, firm; calyx-lobes subu- 

 late, 2"-4" loug. North Carolina to Georgia, A-labama 

 and Missouri. Perhaps specifically distinct. 



6. Houstonia ciliolata Torr. Fringed 



Houstonia. (Fig. 3398.) 



Houstonia ciliolata Torr. FI. N. U. S. i: 173. 1824. 

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



5, 212. 1867. 



Perennial, tufted, erect or ascending, \'-l' high. 

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

 vate'or oblanceolate, obtuse, 6"-io" long, their mar- 

 gins conspicuoush' ciliate; stem leaves oblong or ob- 

 lanceolate, sessile or nearly so; flowers in corymbed 

 cymes; pedicels filiform, i"-4" long; corolla funnel- 

 form, lilac or pale purple, about 3" long, the lobes 

 about "one-third the length of the tube; capsule little 

 compressed, obscurely didymous, lYz" wide, over- 

 topped by the linear-lanceolate calyx lobes. 



On rocks and shores, Maine (?), Ontario to Michigan, 

 south to Pennsylvania, West Virginia, Kentucky and 

 Arkansas. May-Aug. 



7. Houstonia longifolia Gaertn. Long- 

 leaved Houstonia. (Fig. 3399.) 



Houstonia longifolia Gaertn. Fruct. i: 226. pi. 40. f. 8. 



1788. 

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



5, 212. 1868. 



I'erennial, usually tufted, erect, glabrous, 5'-lo' 

 high. Basal leaves spatulate or oblanceolate, ob- 

 tuse, not ciliate, very short-petioled; stem leaves 

 linear or linear-oblong, acute or obtuse, i-nerved, 

 6"-i2" long, V-zyi" wide; flowers in corymbed 

 cymes; corolla pale purple or nearly white, 1Y2"- 

 3" long, its lobes about one-third the length of the 

 tube; capsule little compressed, globose-ovoid, 

 about \" in diameter, its upper half free and much 

 exceeded by the subulate calyx-lobes. 



In dry open places, Maine and Ontario to Manitoba, 

 south to Georgia and Missouri. May-Sept. 



