342 OROBANCHACEAE. 



or more; galea large, somewhat broader above, strongly arched, 

 lower lip small, of 3 rounded teeth; filaments glabrous. 



Laurel Canyon, Santa Monica Mountains, Davidson. February. 



2. P. semibarbata Gray. Nearly acaulescent, depressed, more 

 or less pubescent; leaves in a basal tuft, 15-20 cm, long, on petioles 

 mostly exceeding the irregular sessile spikes, 2-pinnately parted 

 or nearly so, the oblong lobes laciniately few-toothed; corolla yel- 

 lowish, tinged with purple, pubescent without, about 2 cm. long; 

 galea nearly straight; filaments villous above. 



Frequent on dry ridges in the open pine forests of all the moun- 

 tains. May-July. 



Family 95. OROBANCHACEAE. 



Broom-rape Family. 



Erect simple or branched, brown, yellow, purplish or 

 nearly white root-parasites. Leaves reduced to alter- 

 nate appressed scales. Flowers perfect. Irregular, sessile 

 in terminal bracted spikes, or solitary and peduncled In 

 the axils of the scales. Calyx 4-5-toothed or 4-5-cleft, 

 or split on one or both sides nearly or quite to the base. 

 Corolla more or less oblique, the limb 2-lIpped, 5-lobed. 

 Stamens 4, didynamous, Inserted in the tube of the 

 corolla alternate with the lobes, a fifth rudimentary one 

 sometimes present. Ovary superior, 1 -celled, with 4 

 parietal placentae; ovules numerous; style slender; 

 stigma discoid, 2-lobed or 4-lobed. Capsule 1 -celled, 

 2-valved. 



Flowers bractless, nearly regular. 1. Thalesia. 



Flowers bracteate, strongly 2-lipped. 2. Orobanche. 



1. THALESIA Raf. 



Glandular or viscid-pubescent simple-stemmed herbs, 

 parasitic on the roots of various plants, with scattered 

 scales, and long-peduncled yellowish white or violet, per- 

 fect bractless flowers. Calyx campanulate or hemi- 

 spheric, nearly equally 5-cleft, the lobes acute or acumi- 

 nate. 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 



