330 Boraginaceae 
FF. Calyx-lobes glabrous on the back. E. 
M. paniculata Don. (Tall Lungwort) 
DD. Upper leaf-surface smooth or merely papillose. 
G. Calyx-lobes pubescent on the back. C. E. 
M. subcordata Gr. 
GC. Calyx-lobes glabrous on the back. W. E. 
M. leptophylla Pip. 
CC. 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. ambigua Pip. 
II. Leaves acuminate, short-petioled; calyx-lobes acute. E. 
M. brachycalyx Pip. 
HH. Calyx-lobes elongate, acute, much longer than the fruit. 
J. Leaves many, pallid, ovate, acuminate. W. C. E. 
M. laevigata Pip. 
JJ. Leaves few, green, oblong-lanceolate, obtuse or acutish. E. 
M. infirma Pip. 
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 1—1.5 dm. high. E. 
M. pubescens Pip. 
MM. Plant 3—4.5 dm. high. E. 
M. cusickii Pip. 
LL. Leaves glabrous on both sides or merely with some short stiff hairs 
above. E. (M. nutans subcalva.) 
M. nutans Pip. 
KK. Basal leaves none; root not a tap-root, tuberous or fasciculate-tuberous. 
N. Leaves glabrous or merely papillose above. E. (M. pulchella glauca. ) 
M. pulchella Pip. 
NN. Leaves stiff-hairy above. 
O. Corolla-tube |—2 times as long as its limb. E. 
M,. horneri Pip. © 
OO. Corolla-tube 3—4 times as long as its limb. FE. (M. longiflora.) 
M. oblongifolia Don. 
LITHOSPERMUM GROMWELL 
Annual or perennial (ours), pubescent or hairy. Leaves sessile. Flowers in leafy- 
bracted spikes, white or yellow or blue. Calyx-lobes narrow. Corolla salverform or 
funnelform; throat pubescent or crested. Ovary 4-lobed; style slender; stigma 2-lobed 
or entire. Nutlets ovate, usually white and smooth, erect, attached at base; gynobase 
flat, scar flat, rather small. (Gk. lithos—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. ecalifornicum Gray 
AA. Sepals 6—8 mm. long; corolla 12—16 mm. long, dull greenish-yellow, lobes 
about equaling the throat. W.E. (L. pilosum.) 
L. ruderale Doug]. (Woolly Gromwell) 

