[Anoplanthus Endl. Icon. Gen. Pl. 12. pl. 72. 1838.] [Aphyllon A. Gray, Man. 290. 1848.] Glandular or viscid-pubescent simple-stemmed herbs, parasitic on the roots of various plants, with scattered scales, and long-peduncled yellowish white or violet, complete and perfect flowers without bractlets. Calyx campanulate or hemispheric, nearly equally 5-cleft, the lobes acute or acuminate. Corolla oblique, the tube elongated, curved, the limb slightly 2-lipped, the upper lip erect-spreading, 2-lobed, the lower spreading, 3-lobed, the lobes all nearly equal. Stamens included; anther-sacs mucronate at the base. Ovary ovoid; placentae equidistant, or contiguous in pairs; style slender, deciduous; stigma peltate, or transversely 2-lamellate. [Dedicated to Thales.l About 5 species, natives of North America. Type species: Orobanche uniflora L. Stem very short; peduncles 1-4, erect; calyx-lobes lanceolate, acuminate.

1. T. uniflora.

Stem erect, 2'-5' high; peduncles several; calyx-lobes broad, acute.

2. T. fasciculata.

1. Thalesia Uniflora (L.) Britton. Pale Or Naked Broom-Rape. One-Flowered Broom-Rape. Squaw-Drops. Cancer-Root

Fig. 3876

Orobanche uniflora L. Sp. Pl. 633. 1753. Anoplanthus uniflorus Endl. Icon. Gen. Pl. 12. pl.

72. 1838. Aphyllon uniflorum T. & G.; A. Gray, Man. 290.

1848. T. uniflora Britton, Mem. Torr. Club 5: 298. 1894.

Stem usually less than 1' long, nearly subterranean, bearing several ovate-oblong scales and 1-4 slender erect scape-like glandular-puberulent naked 1-flowered peduncles 3'-8' high. Calyx campanulate, pubescent, glandular, 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"-12" 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 Ontario, South Carolina and Texas. Far western plants, formerly referred to this species, prove to be distinct. Pipes. April-June.

1 Thalesia Uniflora L Britton Pale Or Naked Broom  5471 Thalesia Uniflora L Britton Pale Or Naked Broom  548

2. Thalesia Fasciculata (Nutt.) Britton. Clustered Or Yellow Cancer-Root

Fig. 3877

Orobanche fasciculata Nutt. Gen. 2: 59. 1818. Anoplanthus fasciculatus Walp. Rep. 3: 480.

1844-45. Aphyllon fasciculatum A. Gray, Syn. Fl. 2: Part 1, 312. 1878. Thalesia fasciculata Britton, Mem. Torr. Club 5:

298. 1894.

Stem erect, 2'-4' high, densely glandular-pubescent, bearing several scales and 3-15 naked 1-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 triangular-ovate, acute, equalling or shorter than the tube; corolla nearly 1' long, purplish to yellow, puberu-lent 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; capsule ovoid to globose.

In sandy soil, parasitic on the roots of various plants, mostly composites, northern Indiana to Minnesota, Yukon and British Columbia, Nebraska, Arizona and California. April-Aug. Thalesia lutea (Parry) Rydb. [Thalesia fasciculata lutea (Parry) Britton] is a race with light yellow flowers, growing on grasses in western Nebraska and Wyoming.