OROBANCHACEAE. 231 



Lower corolla-lip with 3 conspicuous swellings, much larger 



than the galea. 0. hispidus. 



Lower corolla-lip simply saccate, scarcely larger than the galea. 



Bracts very different from the leaves, the upper ones entire. 0. tenuifolius. 



Bracts less different from the leaves, all 3-5-lobed. O. luteus. 



Orthocarpus hispidus Benth. Annual, slender, erect, simple or with few 

 erect branches, rough-hairy throughout, 10-40 cm. high; leaves linear or 

 lanceolate, attenuate, entire or pinnately cleft into 3-5 linear lobes, 2-6 cm. 

 long; spikes dense, narrow; bracts like the leaves, but shorter and broader; 

 calyx-teeth subulate, shorter than the corolla-tube; corolla white, slender, 12-14 

 mm. long; lip with 3 sac-like swellings; galea straight, pointed. Low ground, 

 not common. 



Orthocarpus tenuifolius (Pursh) Benth. Annual, erect, branched above, 

 10-20 cm. high, sparsely hairy; leaves narrow, 2-4 cm. long, entire or pinnately 

 cleft into 3-5 linear lobes; spikes dense, 1-6 cm. long, 2 cm. broad; bracts 

 broad, obtuse, purple-tipped, the upper entire, the lower with 1-2 small lobes 

 on each side, coarsely ciliate; calyx half as long as the corolla, 2-lipped, each 

 lip bearing 2 subulate teeth; corolla yellow, narrow, exceeding the bracts, 

 15 mm. long, the small hooked galea surpassing the sac-like lip. Low ground, 

 common. 



Orthocarpus luteus Nutt. Annual, somewhat viscidly pubescent; stems 

 erect, slender, 15-40 cm. high; leaves mostly entire, linear to lanceolate, 

 long-acuminate, 2-4 cm. long; spike dense, the bracts green, broader and 

 shorter than the leaves, mostly 3-cleft; calyx-teeth acute; corolla bright yellow, 

 10-12 mm. long, much longer than the calyx. Spokane County, rare. 



Family 83. OROBANCHACEAE. BROOMRAPE FAMILY. 



Root-parasitic herbs, destitute of foliage and green color, 

 yellowish or brownish throughout; leaves reduced to alternate 

 scales; flowers solitary, in loose clusters or in spikes; calyx 4- or 5- 

 toothed or parted; corolla gamopetalous, tubular, more or less 

 2-lipped, hypogynous; stamens 4, didynamous, epipetalous; style 

 long; stigma large; ovary 1 -eel led, with 2 or 4 parietal placentae; 

 capsule 1-celled, 2-valved; seeds very numerous, minute. 



Flowers in spikes, sessile or nearly so, bracteate. 345. OROBANCHE, 231. 



Flowers solitary or in loose clusters, long-pedicelled, 

 bractless. 346. THALESIA, 232. 



345. OROBANCHE. 



Parasitic herbs on the roots of various plants, usually yellowish 

 or reddish; flowers in spikes, sessile or nearly so, with bracts; 

 calyx deeply 2-lobed, the lobes often 2-cleft; corolla irregular, the 

 tube slightly curved, the upper lip erect or incurved, the lower 

 spreading; capsule 2-valved. 



Orobanche ludoviciana Nutt. Whole plant reddish-yellow, viscid-pu- 

 bescent; stem stout, erect, simple or with erect branches, scaly, 15-25 cm. long; 

 flowers 2-bracted at the base of the calyx, in dense spikes, looser below; calyx 

 unequally 5-cleft, the lobes linear-lanceolate; corolla yellowish, 12-15 mm. 



