232 PLANTAGINACEAE. 



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

 River on the roots of Artemisia dracunculoides and Chrysopsis villosa. 



346. THALESIA. 



Yellowish, violet or nearly white herbs, parasitic on the roots of 

 various plants; scale-leaves scattering; flowers solitary or in 

 loose clusters; calyx 4- or 5-cleft; corolla 2-lipped, the upper lip 

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

 included. 



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



Calyx-lobes triangular, shorter than the tube. T. fasciculate,. 



Thalesia uniflora (L.) Britt. Stem stout, 1-4 cm. long, mostly sub- 

 terranean, with a few ovate obtuse scales and bearing 1-5 or more 1-flowered 

 glandular-puberulent peduncles 5-12 cm. high; calyx glandular, the obconic 

 or campanulate tube exceeded by the narrow subulate lobes; corolla violet or 

 yellowish, 1-2.5 cm. long, glandular-puberulent without. Parasitic mainly 

 on Tellima and Eriogonum. Not rare. 



Thalesia fasciculata (Nutt.) Britt. Stems elongated, 2-12 cm. long, 

 bearing a cluster of 2-30 very glandular 1-flowered peduncles, 5-10 cm. high; 

 calyx-tube campanulate, about as long as the broad triangular lobes; corolla 

 yellowish, 1-2 cm. long. In sandy or gravelly soil. On the roots of various 

 plants. 



Family 84. PLANTAGINACEAE. PLANTAIN FAMILY. 



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

 corolla gamopetalous, dry and membranaceous, veinless; stamens 

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

 2 or falsely 3-4 celled; ovules 1-several in each cavity. 



347. PLANTAGO. PLANTAIN. 



Leaves nerved or ribbed, radical; flowers small, in bracted 

 spikes, on naked scapes; calyx of 4 persistent sepals; corolla 

 salverform or rotate, 4-parted; stamens 4, or rarely 2, in all or 

 some flowers with long exserted filaments; ovary 2-celled; ovules 

 1 several in each cell; capsule 2-celled, 2-several-seeded. 



Leaves broad, oval or ovate. P. major. 

 Leaves narrow, lanceolate or linear. 



Leaves pubescent, green. P. lanceolata. 



Leaves white-villous. P. purshii. 



Plantago major L. Common Plantain. Perennial, pubescent or glabrous, 

 the erect scapes mostly 10-30 cm. high; leaves broadly ovate, 3-5-ribbed, 

 obtuse or acute, rounded at base, entire or coarsely dentate, 3-20 cm. long; 

 on stout channeled petioles; spikes 5-20 cm. long; flowers all alike, perfect; 

 sepals ovate or oblong, obtuse, shorter than the acutish capsule; seeds 6-15. 

 Introduced and spreading, or one form perhaps native. 



