358 BORAGINACEAE 



Calyx markedly accrescent, in fruit 3 to 5 lines long ; nutlets with hairy-tufted bristles ; 

 scar ovate or deltoid, lateral but reaching the base of the nutlet ; Great Valley 

 and Livermore Valley 15. A. humistrata. 



S. Scar distinctly above the base on the ventral side, deeply excavated or hollowed, large (Yi to 



Yi as long as the nutlet) ; nutlets armed with minute spine-like bristles or barbed 



prickles (except A. glyptocarpa and A. distanti flora ) . 



Stems rigid, prostrate ; calyx strongly accrescent, the lobes directed to one side ; nutlets white- 

 reticulate on a brown ground, the ridges with microscopic tufts of bristles.. 16. A. scripta. 

 Stems erect or ascending; calyx not strongly accrescent, remaining symmetrical. 



Nutlets with the body quadratish or somewhat hexagonal and abruptly narrowed to a beak- 

 like ape.x. 

 Nutlets arched and incurved at apex, destitute of bristles, the beak not compressed. 



Corolla 2 to 3 lines broad ; nutlets sharply rugose dorsally, the rugae forming small, 

 irregular or imperfect areolae, the areolae papillate; n. Sierra Nevada 



foothills and Lake Co 17. A. glyptocarpa. 



Corolla % line broad ; nutlets transversely tuberculate-rugose dorsally or inter- 

 rupted rugose, the rugae separated by llneate grooves; cent, and n. Sierra 



Nevada foothills 18. A. distantiflora. 



Nutlets not arched, not incurved at apex, armed on the keels and lateral angles with a 

 few spines (the spines rarely absent) ; apex of the nutlets beak-like, laterally 



compressed; n. Sierra Nevada foothills and bordering plain 19. A. atistinae. 



Nutlets broadly ovate, acute (not abruptly narrowed at apex) ; calyx in anthesis tawny- 

 hirsute or ta^vny-tipped. 

 Nutlets thickly set with slender distinct barbed spines, not rugulose ventrally ; cent. Cal. 



to n. Cal 20. A. greenei. 



Nutlets dorsally rugose-reticulate, the thin rugae and the surface generally armed with 

 barbed spines dilated at base (the spines rarely absent) ; ventral side with a 

 narrow band of smooth white convolute rugae either side of carina ; cent. Cal. 

 to s. Cal 21. A. acanthocarpa. 



1. A. mollis Greene. Densely leafy plant, the stems 1 to several from the base, 

 spreading or ascending, 2 to 7 inches high, densely spreading-pilose ; leaf -blades 

 linear, obtuse, densely ascending-hirsute with long soft hairs, IV2 to 314 inches 

 long; racemes dense or at length loose, 1 to 3 inches long, bractless ; corolla 2% to 

 3 lines broad; nutlets ovate, irregularly rugose-reticulate with very small or mi- 

 nute areolae little or no wider than the rugae; ventral side of nutlets markedly 

 keeled down to the ovate sub-basal scar ; dorsal side of nutlets shortly keeled at 

 apex, the lateral angles with a somewhat evident keel; entire surface of nutlets 

 thickly papillate microscopically. 



Moist alkaline flats and borders of ponds, 4000 to 5500 feet : east side of the 

 Sierra Nevada from Sierra Co. to Modoc Co., also occasionally on west slope in high 

 easterly valleys of Plumas Co. Extending to western Nevada and north to eastern 

 Oregon. July. 



Locs. — Sierra Valley; Portola, Plumas Co., K. Brandegee ; Pitt Eiver, near Alturas, E. M. 

 Austin; Egg Lake, w. Modoc Co., M. S. Baker. 



Befs. — Allocakta mollis Greene, Pitt. 1 :20 (1887) ; Jepson, Man. 851 (1925). Eritrichium 

 molle Gray, Proc. Am. Acad. 19:89 (1883), type loc. Sierra Valley, Sierra Co., Lemmon. Kry- 

 nitzkia mollis Gray, I.e. 20:267 (1885). Plagiobothrys mollis Jtn., Contrib. Gray Herb. 68:74 

 (1923). 



2. A. vestita Greene. Rank plant with ascending stems 1 to II/2 feet high; 

 herbage conspicuously and densely pilose throughout even to the calyx ; spikes 3 

 to 6 inches long, bractless; corolla about 2 lines broad; fruiting calyces discrete; 

 nutlets brown, nearly 1 line long, regularly reticulate, the areolae several times 

 broader than the rugae ; dorsal side of nutlets keeled shortly at apex or from the 

 apex to below the middle, the keel in either case vanishing in the meshes of the 

 reticulation, or not keeled ; lateral angles rounded ; ventral side of nutlets strongly 

 ridged down to the ovate or roundish scar, which is bounded toward the base by 

 a horseshoe-shaped ridge ; areolae and rugae densely papillate microscopically. 



Valley flats, 10 to 400 feet : southern Sonoma Co. June-July. 



