196 



OROBANCHACEAE. 



Calyx 4-toothed; stems mostl3- branched. 

 Calyx split on both sides; stem simple. 

 Calyx 5-cleft;*stem simple. 



[VOL. III. 



1. O. rainosa. 



2. O. minor. 



3. O. Ludoviciana. 



i. Orobanche ramosa L. Hemp or 

 Branched Broom-rape. (Fig. 3360.) 



Orobanche ramosa I. Sp. PI. 633. 1753. 



Plant yellowish; stem rather slender, branched, 

 or rarely simple, s'-ijj' high, the scales few and 

 distant, 2 // -j // long. Spike loosely many-flowered, 

 denser above than below, the lowest flowers short- 

 pedicelled; bracts usually 3, the longest about equal- 

 ling the calyx ; calyx 4-toothed, the teeth triangular- 

 ovate, acute, or acuminate, about as long as the 

 tube; corolla 5" -9" long, the tube yellow, slightly 

 constricted above the ovary, the limb bluish. 



Parasitic on the roots of hemp and tobacco, Kentucky. 

 Adventive or naturalized from Europe. Summer. 



2. Orobanche minor J. E. Smith. 



Lesser or Clover Broom-rape. Herb- 

 bane. (Fig. 3361.) 

 O. minor J. E. Smith, Engl. Bot. pi. 422. 1797. 



Plantyellowish brown; stem rather stout, sim- 

 ple, 4 / -20 / high; lower scales numerous, ovate- 

 oblong, the upper lanceolate, acute, scattered, 

 3 // -io // long. Spike dense, or the lower flowers 

 separated, 3 / -8 / long; bracts lanceolate, equal- 

 ling or longer than the flowers; flowers 5" -9" 

 long; calyx split both above and below, each of 

 the lateral segments 2-cleft, the teeth lanceolate- 

 subulate; corolla-tube yellowish, scarcely con- 

 stricted above the ovary, the limb bluish. 



Parasitic on the roots of clover, New Jersey to 

 Virginia. Naturalized from Europe. Called also 

 D^vil's-root and Hell-root. May-July. 



3. Orobanche Ludoviciana Nutt. Louis- 

 iana Broom-rape. (Fig. 3362.) 



Orobanche Ludoviciana Nutt. Gen. 2: 58. 1818. 

 Aphyllon Liidovicianum A. Gray, Bot. Cal. 1: 585. 

 1876. 



Stems stout, simple, solitary or clustered, viscid- 

 puberulent, 4 / -i2 / high, scaly. Flowers 6 // -8 // long, 

 very numerous in dense terminal spikes, 1-2-bracted 

 under the calyx; calyx 5-cleft, the lobes somewhat 

 unequal, linear-lanceolate, acuminate, longer than 

 the corolla-tube, or shorter; corolla 2-lipped, pur- 

 plish, its tube narrow, about twice as long as the 

 limb; anthers woolly; capsule ovoid-oblong, shorter 

 than the calyx. 



In sandy soil, Illinois to the Northwest Territory, south 

 to Texas, Arizona and California. June-Aug. 



3. CONOPHOLIS Wallr. Orobanch. 78. 1825. 

 An erect stout simple glabrous, densely scaly, light brown herb, parasitic on the roots of 

 trees, with yellowish flowers 2-bracteolate under the calyx, in a thick dense bracted spike, the 



