CA, Southern California, 20070815
Madison Heights, mustard. 

Brassica nigra [] 

In crack against wall of little house just to east of Budget on Fillmore between Arroyo and Marengo.  Just realized I've never "studied" any of the mustards in the area. 

GEN

peren herb

ST

sev brs from near base, d retrorse bristly

LF

basal   oblance, pin lobed esp bel but w large term pinna, toothed, d stiff sharp thick-bristly caul   alt, strongly reduced, even top-most not sess, becoming oblong to lin but almost all lobed

INFL

d term rac, no bracts, fls spread to ascend, frs ascend to erect

PET

4, yell, claw, etc

FR

minute, lin, 2 chamb, 1 row seeds per chamb, prom beak, no stipe, bristly

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