1 66 Flora of the Palouse Region 



277. OROBANCHE. 



Reddish yellowish violet or nearly white herbs, parasitic on the 

 roots of various plants: scales scattering: flowers solitary or in 

 spikes or racemes: calyx 4 or 5-cleft: corolla 2-lipped; upper lip 

 erect, mostly 2-lobed or emarginate, the lower spreading: stamens 

 included. 



Flowers solitary, terminating long peduncles. 



Calyx-lobes subulate, longer than the tube. O. uniflora. 



Calyx-lobes triangular, shorter than the tube. O. FASCICULATA. 



Flowers spicate. O. ludoviciana. 



0. uniflora L. (Thalesia purpurea Heller.) Stem stout, 1-4 cm. long, 

 mostly subterranean, with a few ovate obtuse scales and bearing 1-5 or more 

 i-flowered glandular-puberulent peduncles 8-12 cm. high: calyx glandular, 

 the obconic or campanulate tube exceeded by the narrow subulate lobes: 

 corolla violet or yellowish, 1-2.5 cm - l° n g> glandular-puberulent without. 

 Parasitic mainly on Tellima and Eriogonum. Not rare. 



0. fasciculata Nutt. Stems elongated, 2-12 cm. long, bearing a cluster 

 of 2-30 very glandular i-flowered peduncles, 5-10 cm. high: calyx-tube cam- 

 panulate, about as long as the broad triangular lobes: corolla yellowish, 1-2 

 cm. long. Sandy soil along Snake River. On the roots of various plants. 



0. ludoviciana Nutt. Whole plant reddish-yellow, viscid-pubescent: 

 stems 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 un- 

 equally 5-cleft, the lobes linear-lanceolate: corolla yellowish, 12-15 mm. long, 

 the lobes acute, hardly spreading. In the sand on the banks of Snake 

 River on the roots of Artemisia dranunculoides and Chrysopsis villosa. 



Family 71. PLANTAGINACEAE. 



Mostly stemless herbs: flowers regular, 4-merous, in spikes: 

 corolla gamopetalous, dry and membranaceous, veinless: stamens 

 4 or 2 on the corolla-tube, alternate with its lobes: ovary 2 or 

 falsely 3-4 celled: ovules i-several in each cavity. 



278. PLANTAGO. 



Mostly stemless herbs: leaves nerved or ribbed, radical: flowers 

 small, in bracted spikes on naked scapes, perfect or sometimes 

 more or less dioecious: calyx of 4 persistent sepals: corolla salver- 

 form or rotate, 4-parted: stamens 4, or rarely 2, in all or some 

 flowers with long exserted filaments: ovary 2-celled; ovules 1 -sev- 

 eral in each cell: capsule 2-celled, 2 several-seeded. 



Leaves broad, oval or ovate. P. major. 



Leaves lanceolate, white-villous. P. PURSHii. 



Leaves lanceolate, pubescent, green. P. i.anceolata. 



