"^8 TRIANDRIA. DIGYNIA. 



scabrous. Calix smooth, nerveless, exterior valve in the 

 oukr flowers setaceous from lis base, the inner valves ob- 

 liquely dilated, and rigidly coriaceous, all awned, the in- 

 ner divisions of tiie lateral flowers, appearing- nearly se- 

 mi-ovaie, the central ones sublanceolate. Corolla nerve- 

 Jess, the inner valve furnished with a short awn, arising 

 from its base. Nearly allied, apparently, to the H. mari^ 

 timum. 



On the arid and saline plains of the Missouri. 



3 jubatum. On the calcareous islands of Lake Huron 

 and Michigan, also on the hanks of the Missouri. 



The genus Hordeinn exists chiefly In Kurope, extend- 

 ing" into Northern Africa, and Tartary In Asia. The 2 

 species above described are natives of North America, 

 and the F. jiibatwn Is also common to Smyrna. 



120. SECALE. L. (Rye.) 



Calix S-valved, valves opposite, or 1-valvecl 

 and many-flowered; giurijes linear-lanceolate, 

 smooth, or channelled on either side; exterior 

 valve terminated by a long awn. — Flowers 

 spiked, racliis toothed. 



PpEciEs. 1. S.cereale, Cultivated, No where natu» 

 rtliztd or indig-eaous la the United States. Native in the 

 isle of Crete. 



i21. TRITICUM. Z. (Wheat.) 



CnlLx 2-valved, solitary, many-flowered; 

 valves parallel to the rachis. Flowers some- 

 what obtuse, glumes unarmed, or interruptedly 

 awned. Spikelets rather short, approximating 

 ,on the sides of a flat rachis. 



Species. 1. T. sativum. Cultivated. Of this Impor- 

 tant species there are 3 well known varieties, as x. (csti. 

 viim (Spring-wheat). /3. hybermim (autumnal or winter- 

 wheat), y. dunon, with the culm solid, and the seed hard, 

 and afTording but little farina. This worthless variety is 

 the only one cultivated throughout Barbary. The native 

 place of this species, as well as the T. polojiicum and T. 

 SpeUa, can now no longer be ascertained; still it appears 

 probable that the T, sativum originated in Egypt, the era. 



