56 Contributions from the Gray Herbarium 
Potosi. The size of the flowers is likewise a variable factor in this 
genus and frequently the earlier flowers are larger than those which 
appear after fruit has formed. However this may be in the case of 
L. Conzattii, it agrees in all other respects with L. calcicola, so that 
its reduction argues for a better understanding of the latter, which 
originally was based on a single collection. Thus interpreted, L. 
calcicola seems to be not uncommon from San Luis Potosi to 
Oaxaca 
J are strictum Lehm., var. calycosum, var. nov., foliis 
caulinis oblongis circa 5 mm. latis; calycibus mer elongatis 
mm. longis. — MrExico: Guana juato, June, 1907, A. és, 
no. 5 (Typr, Gray Herb.); San Luis Potcal 1878, Parry & Palmer 
no. 622; near San Miguelito, San Luis Potosi, 1876, er no. 
728; Ixmilquipan, Hidalgo, sy. 1905, Purpus, no. 
Like the typical form except for the broader eee ‘aa the ac- 
crescent sepals, but the leaves vary from narrowly linear to oblong 
in the species, the variety merely representing the extreme form, 
and the sepal-development, although not an unusual phenomenon 
in many plants, often, as here, seems worthy of note. 
Lithospermum obovatum, spec. nov., peer scat ao stric- 
tum 1.5-2.5 dm. ating foliis = perio latissimis obovato-spath- 
ci definitis corollae lobis oppositis; limbi lobis corners 
minute — — lobis fere linearibus ares 5 mm. longis; 
nuculis ign Ico: = ms (op “een Siar reg May 
Fas ie senlininalie very near L. ae Gncus but seem- 
ingly distinct by virtue of the broad basal leaves, shorter cauline 
leaves, denser pubescence and larger flowers. The scalloped mar- 
gin of the gland-covered surface of the throat is sharply defined 
in this plant while in L. cobrense the scallops are not at all definite. 
Striking in the aspect of L. obovatum are the remarkable basal 
“ 
acrotomia densiflora (Ledeb.), comb. nov. M. cephalotes (DC.) 
na Fl. Orient. iv. 612 (1879). Arnebia cephalotes DC. Prod. x 
96 (1846). Lithospermum densiflorum Ledeb. in Bull. Sci. Pada 
