BORAGINACEAE (BORAGE FAMILY) 191 



MERTENSIA (Lungwort) 



Perennial. Flowers rather large, in panicles or cymes or racemes. Calyx 

 lobes linear to triangular, not much enlarged in fruit. Stamens included. 

 Ovary 4-divided. Nutlets wrinkled when mature. — (Honor of F. K. Mer- 

 tens, a German botanist.) 



A. Plants of the seashore; nutlets fleshy, smooth and shining. W. 

 AA. Plants not of the seashore; nutlets dry, wrinkled when mature. 



M. maiitUna (sea lungwort) 

 B. Plants 5-10 dm. high; leaves thin, wide. 1 



C. Leaves soft-hairy beneath, upper surface various; calyx glabrous or hairy on the 

 back. 

 D. Upper leaf surface stiff-hairy. 



E. Calyx lobes canescent. E. M. membranacea 



EE. Calyx lobes not canescent. 

 F. Calyx lobes pubescent on the back. W. M. plat3rphylla 



FF. Calyx lobes glabrous on the back. E. M. panlciilata (tall lungwort) 

 DD. Upper leaf surface smooth or merely papillose. 

 G. Calyx lobes pubescent on the back. C. E. M. subcordata 



GG. Calyx lobes glabrous on the back. W. E. M. leptophylla 



CO. Leaves glabrous on both sides or merely papillose above; calyx glabrous on 

 the back. 

 H. Calyx lobes either short and obtuse or triangular and acute, not longer than 

 the fruit. 

 I. Leaves acute, mostly sessile; calyx lobes obtuse. C. M. amblgua 



n. Leaves acuminate, short-petioled; calyx lobes acute. E. M. brachycalyx 

 HH. Calyx lobes elongate, acute, much longer than the fruit. 

 J. Leaves many, pallid, ovate, acuminate, W. C. E. M, laevigata 



JJ. Leaves few, green, oblong-lanceolate, obtuse or acutish. E. M. Infinna 



BB. Plants 1.5-4 dm. high; leaves narrow, thickish. 

 K. Basal leaves numerous, their dry bases remaining on the crown of the root; 

 root vertical, not tuberous. 

 L. Leaves pubescent on both sides. 

 M. Plant i-i.s dm. high. E. M. pubescens 



MM. Plant 3-4.5 dm. high. E. M. cuslckii 



LL. Leaves glabrous on both sides or merely with some short stiff hairs above. E. 



M. nutans 



KK. Basal leaves none; root not a taproot, tuberous or fasciculate-tuberous. 



N. Leaves glabrous or merely papillose above. E. M. pulchella 



NN. Leaves stiff-hairy above. 



O. Corolla tube 1-2 times as long as its limb. E. M. homerl 



00. Corolla tube 3-4 times as long as its limb. E. M. oblongifolia 



LITHOSPERMUM (Cromwell) 



Perennial. Leaves sessile. Corolla salverform or funnelform; throat 

 pubescent or crested. — (Gk. litkos = a stone, sperma — a seed.) 



A. Sepals 8-16 mm. long; corolla about 20-25 mm. long, bright yellow, lobes much 

 shorter than the throat. U. L. callfomicum 



AA. Sepals 6-8 mm. long; corolla 12-16 mm. long, dull greenish-yellow, lobes about 

 equaling the throat. W. E L. ruderale (woolly gromwell) 



