BORAGINACEAE. 307 



1. C. muriculata (A. DC.) Greene. Rather stout, branching, 

 rough-hirsute or hispid, 2-4 dm. high, with well-developed rather 

 dense spikes, mostly in 2's and 3's at the ends of the branches; 

 calyx about 3 mm. long, lanceolate; corolla 4-6 mm. long; nutlets 

 2 mm. long, muricate-papillose and somewhat rugose on the back; 

 ventral groove and its basal bifurcation mostly closed, lateral angles 

 acutish, distinct. 



Frequent in the upper portions of the chaparral belt and in the 

 pine belt of the mountains. 



2. C. barbigera (Gray) Greene. Rather stout, much branched, 

 2-4 dm. high, hispid and hirsute; leaves narrowly linear; spikes 

 elongated, the flowers becoming rather distant; calyx-lobes linear, 

 attenuate, 6-8 mm. long in fruit, covered with long shaggy bristles, 

 usually intermingled with long white villous hairs; corolla often 

 6 mm. broad; nutlets rarely acuminate, about 2 mm. long, grayish, 

 muricate-papillose; scar open, dilated at base. 



Common in open dry places on the plains and foothills. March- 

 May. 



3. C. intermedia (Gray) Greene. Resembling the last in habit; 

 calyx-lobes 3-5 mm. long, armed with rather rigid and pungent, 

 whitish or rusty-yellowish bristles; corolla usually less than 4 mm. 

 broad; nutlets grayish, about 2 mm. long, oblong-ovate, thickly 

 rough-muricate; scar wholly or partly open, with an open areola. 



Frequent on dry open ridges and on the plains in the interior 

 region. March-May. 



4. C. ambigua (Gray) Greene. Stems rather slender, loosely 

 branching, 20-25 cm. high, sparsely hispid and hirsute; leaves rather 

 broadly linear; flowers becoming scattered; calyx-lobes 5-7 mm. 

 long, beset with rather short, rigid bristles; corollas about 3 mm. 

 broad; nutlets deltoid-ovate, 2 mm. long, brownish, sparsely and 

 faintly muricate. 



Occasional in the upper portions of the chaparral belt and among 

 the pines. May-July. 



5. C. flaccida (Lehm.) Greene. Slender, strict, 3-6 dm. high, 

 strigulose with minute close pubescence; leaves linear, minutely 

 more or less strigulose-hispid; calyx erect in fruit, appressed to the 

 rachis, 4-5 mm. long; sepals filiform-linear, thickish below, their 

 bases very hispid with deflexed and strong, somewhat hooked bristles; 

 nutlets solitary, scarcely flattened ventrally, the groove of attach- 

 ment enlarged at base but not furcate. ( Krynitzkia oxycarya Gray.) 



Known in our region only from Chatsworth Park. 



6. C. microstachys Greene. Rarely over 3 dm. high, much 

 branched from the base, hispidulous or hispid; calyx in fruit ascend- 

 ing or erect, but not appressed to the rachis, 2-3.5 mm. long; sepals 



