538 CONTRIBUTIONS PROM THE NATIONAL HERBARIUM. 



2. Heliotropium greggii Torr. U. S. & Mex. Bound. Bot. 137. 1859. 



Type locality: Valley of the Conehos near Santa Rosalia, Mexico. 



Range: Western Texas to New Mexico and Mexico. 



New Mexico: South of White Sands; mesa near Agricultural College; Artesia; 

 Roswell. Sandy plains, in the Lower Sonoran Zone. 



123. BORAGINACEAE. Borage Family. 



More or less rough-hairy annual or perennial herbs, with simple, alternate, exstip- 

 ulate leaves, the flowers in cymes, these often helicoid; leaves mostly entire and small; 

 flowers perfect, usually regular; calyx of 5 united persistent sepals; corolla tubular, 

 funnelform, or salverform, deciduous; stamens 5, adnate to the corolla tube; filaments 

 sometimes appendaged; pistil with a single style; ovary deeply 4-lobed; stigmas 

 simple or 2-lobed; fruit of 2 or 4 seed like nutlets. 



key to the genera. 



Corolla oblique, the lobes unequal 13. Echitjm (p. 547). 



Corolla regular, with equal lobes. 



Nutlets with hooked prickles, at least on the 

 margins. 



Nutlets spreading, covered with prickles 1. Cynoglossum (p. 539). 



Nutlets erect or incurved, with prickles on the 



back or angles 2. Lappula (p. 539). 



Nutlets unarmed or if prickly the prickles not 



curved. 



Receptacle (gynobase) flat or slightly convex; 



nutlets attached laterally or by the base. 



Nutlets obliquely attached; corolla blue 



or pink, tubular-funnelform 3. Mertensia (p. 541). 



Nutlets attached at the very base; corolla 

 never blue or pink, of various 

 shapes. 

 Corolla salverform, mostly yellow (in 



one species greenish) 4. Lithospermum (p. 542). 



Corolla tubular, slightly open at the 

 throat, with erect lobes, mostly 

 dull greenish yellow. 

 Stamens included; corolla about 



1 cm. long 5. Onosmodium (p. 543). 



Stamens exserted; corolla 3 cm. 



long or more 6. Macromeria (p. 543). 



Receptacle (gynobase) elongated or conic; 

 nutlets attached laterally. 

 Nutlets attached below the middle, 

 mostly near the base. 

 Perennial, cespitose; flowers bright 



blue 7. Eritrichium (p. 544). 



Annual; flowers white 12. Allocarya (p. 547). 



Nutlets attached at the middle or from 

 the base to or above the middle. 



Perennials 10. Oreocarya (p. 544) . 



Annuals. 



Nutlets attached by the middle. . 9. Plagiobothrys (p. 544). 



