Vol. III.] 



BROOM-RAPE FAMILY. 



195 



1. Thalesia uniflora (L.) Britton. Pale or Naked Broom-rape. 

 One-flowered Broom-rape. Cancer-root. (Fig. 3358.; 



Orobanchc uniflora L. Sp. PI. 633. 1753- 

 Anoplanthus uniflorus Endl. Icon. Gen. PI. 12 



pi. 72. 183S. 

 Aphvllon unifiorum T. &G.; A. Gray, Man. 290. 



1848. 

 T. uniflora Britton, Mem. Torr. Club, 5: 298.^ 1S94. 



Stem usually less than 1/ long, nearly sub- 

 terranean, beariug several ovate-oblong scales 

 and 1-4 slender erect scape-like glandular- 

 puberulent naked i-flowered peduncles $'-W 

 high. Calyx campanulate, pubescent, glandu- 

 lar, 4 // -5 // high, less than one-half the length 

 of the corolla, its lobes as long as the tube or 

 longer, lanceolate, acuminate; corolla white 

 or violet, puberulent without, 8 // -l2 // long, 

 the curved tube about 3 times as long as the 

 limb, the short lobes oval or obovate, obtuse; 

 placentae nearly equidistant; capsule ovoid, 

 longer than the calyx. 



In woods and thickets, parasitic on the roots of 

 various herbs, Newfoundland to British Columbia, 

 Virginia, Ohio, Texas and California. April-June. 



2. Thalesia fasciculata (Nutt.) 

 Britton. Clustered or Yellow Cancer- 

 root. (Fig. 3359-) 



Orobanche fasciculata Nutt. Gen. 2: 59. 1818. 

 Anoplanthus fasciculatus Walp. Rep. 3: 480. 



1844-45- 

 Aphyllon fasciculalum A. Gray, Syn. Fl. 2: 



Part 1, 312. 1878. 

 Thalesia fasciculata Britton, Mem. Torr. Club, 

 5: 298. j 1894. 



Stem erect, 2 / -4 v high, densely glandular- 

 pubescent, bearing several scales and 3-15 

 naked i-flowered peduncles 1/-4/ long. 

 Calyx glandular, broadly campanulate, 3"- 

 5" high, about one-third the length of the 

 corolla, its lobes triangular-lanceolate or tri- 

 angular-ovate, acute, equalling or shorter 

 than the tube; corolla nearly i / long, pur- 

 plish-yellow, puberulent without, the curved 

 tube 3 times as long as the limb, the lobes 

 oblong, obtuse, the limb more manifestly 

 2-lipped than in the preceding species; cap- 

 sule ovoid to globose. 



In sandy soil, parasitic on the roots of various plants, northern Indiana to the Northwest Territory 

 and British Columbia, south to Nebraska, Arizona and California. April-Aug. 



Thalesia fasciculata lutea (Parry) Britton, Mem. Torr. Club, 5: 298. 1894. 

 Phelipaea lutea Parry, Amer. Nat. 8: 214. 1874. 



Aphyllon fasciculalum var. luteum A. Gray, Syn. Fl. 2: Part 1, 312. 1878. 

 Whole plant light yellow. Western Nebraska and Wyoming. 



2. OROBANCHE L-. Sp. PI. 632. 1753. 



Glandular-pubescent, erect simple or branched, reddish yellowish violet or nearly white 

 herbs, parasitic on the roots of various plants, with scattered scales, and spicate or racemose, 

 complete and perfect, bracted and sometimes bracteoiate flowers. Calyx split both above 

 and below, nearly or quite to the base, the divisions 2-cleft or rarely entire, or more or less 

 unequally 2-5-toothed. Corolla oblique, strongly 2-lipped; upper lip erect, emarginate or 

 2-lobed; lower lip spreading, 3-lobed. Stamens included; anther-sacs mostly mucronate 

 at the base. Placentae equidistant, or approximate in pairs. Style slender, commonly per- 

 sistent until after the dehiscence of the capsule; stigma peltate to funnelform, entire, or later- 

 ally 2-Iamellate. [Greek, Choke- Vetch.] 



About 90 species, natives of the Old World and western America, Besides the following some 6 

 others occur in the western parts of North America. 



