PLAGIOBOTHRYS BORAGINACE^E 485 



OBEOCABYA 



** ** Calyx persistent, not circumscissile near the base: nutlets 

 broadly ovate and not at all cruciform. 



P. Shastensis Greene. Gray 1. c. 284. Canescently silky-tomentose : 

 stem very slender, 4-10 inches high, not branching from the base, simple 

 up to the 1-3 racemes : radical leaves linear to linear-spatulate, 4-8 lines 

 long, appressed-silky above, hispid-ciliate; cauline leaves few linear-lanceo- 

 late, smaller :racemes few-flowered; calyx cylindraceous,4 lines long eilky- 

 lanate both sides, cleft to near the middle; the lobes lingular and acute, 

 nutlets shining, strongly incurved, carinate on the back, obscurely trans- 

 versely rugose but not'muricate. On a gravelly plain near Grant's Pass 

 Oregon, and Shasta Valley California. 



P. coJorans Greene Pitt, iii, 262. Canescently tomentose or the leaves 

 and calyces appressed-silky: stem 2-8 inches high, erect, not branching 

 from the base : radical leaves linear, an inch or more long, in a loose rosu- 

 late tuft; cauline leaves numerous, linear to lanceolate: racemes long and 

 slender, few- to many-flowered often leafy-bracted below : calyx almost 

 globular, 2-3 lines in diameter, cleft to below the middle, the acuminate- 

 triangular lobes connivent over the fruit, sparingly hispid : nutlets broadly 

 orbicular, abruptly stout- beaked, strongly carinate on the back, strongly 

 transverse rugose, obscurely muricate on the ridge j . On gravel-bars along 

 the creek at Hprnbrook California; so near the state line that it may be 

 looked for in adjacent Oregon. 



****; ;4* Calyx at maturity more or less promptly deciduous 

 circumscissilly near the base. 



P. canescens Benth. PL Hartw. 326. Villous-pubescent and some- 

 what cinereous or canescent especially the calyx, which when young may 

 be fulvous or even somewhat rufescent: stem diffusely branched from the 

 base, 10-12 inches high : leaves linear : calyx 2-3 lines long, in fruit loosely 

 erect or sometimes more open and accrescent, rarely disposed to be cir- 

 cumscissile at base: nutlets opaque, not vitreous, slightly carinate on the 

 back, rugose with sparse and somewhat reticulated obtuse wrinkles. Co- 

 lumbia Valley to California. 



P. iiothofulvus Gray Proc. Am. Acad. xx, 285. Soft-hirsute through- 

 out, : stems erect, 1-2 feet high, branching from the base: radical leaves 

 oblong or lanceolate to linear, 1-2 inches long, numerous in a dense rosu- 

 late tuft ; cauline leaves lanceolate to linear, sometimes 1 or 2 pairs opposite : 

 racemes usually geminate or in threes with a flower in the fork, at length 

 long and slender and loosely-flowered : calyx cleft only to the middle, silky- 

 villous, rufescent only when young, soon fulvous or whitish, \- lines long, 

 the acuminate lobes connivent over the nutlets, soon circumscissile, leav- 

 ing a persistent base which surrounds the lower half of the nutlets : corolla 

 2-3 lines broad : nutlets abruptly stout-beaked, carinate on the back, trans- 

 versely rugose and minutely granulate. Common on open hillsides, Brit. 

 Columbia to California west of the Cascade Mountains. 



* * Coarse and rough-hispid much branched low annuals with ob- 

 long or lanceolate leaves, the upper subtending and equalling or ex 

 ceeding the flower-clusters : nutlets inserted by a scar above the mid- 

 dle, ventrally carinate only above the round scar, which is attached 

 to the depressed gynobase by a small and soft false caruncle. 



P. hispidns Gray 1. c. 286. Rough-hispid throughout: stem stout, 

 4-8 inches high, profusely branched : lower leaves linear-spatulate ; upper 

 leaves oblong, 6 lines long : calyx 5-parted, open in fruit, not circumscissile : 

 nutlets turgid, ovoid, obliquely incumbent, acute at the apex, obscurely 

 carinate on the back, opaque, papillose-granulate, the scar hardly above 

 the middle. Southeastern Oregon to eastern California. 



