=Ambrosia psilostachya var. californica
Asteraceae (Sunflower Family)
Perennial with running underground rootstocks; herbage rather harshly
pubescent with short stiff appressed or spreading hairs, glandular, aromatic
when rubbed; stems simple, 3-12 dm. high; lvs. mostly only once pinnatifid, 4-12
cm. long, thickish, often subsessile; staminate heads nodding in bractless
terminal spikes; staminate invols. scabrous-hirtellous; pistillate heads borne
in lf. axils below the staminate spike; pistillate invols. merely tuberculate
above or quite unarmed; fruit, a bur less than 6 mm., obovoid, greenish brown,
puberulent; spines 0-7 below beak, blunt or vestigial.
One of the very common weeds of roadsides and uncultivated lands, sea
level to 2500 ft.; Coastal Sage Scrub, Chaparral, etc. cismontane and in Colo.
desert; n. to Wash; Santa Catalina Id. July-Nov.
Ancient Greek, also Latin, name of several plants.
Psilostachya is from two Greek
words that mean "a bare spike". (Dale
51). See A.
chamissonis for more on the genus name.
Very common in the study area. Photographed
specimens are from North Star Beach, 23rd Street and Big Canyon. (my comments).
One of the principal, late summer, hay fever plants.
A. trifida, which is also found in Calif., has leaves which are
reputed to be stimulating, astringent and antiseptic. (Meyer 125).
Hickman, Ed. 194; Munz, Calif.
Flora 1103; Munz, Flora So. Calif.
112; Roberts 8.
June 4 83 # 12; July 2 83 # 19; July 3 83 # 19.
Identity by R. De Ruff.
Computer Ref: Plant Data 144.
Have plant specimen.
Last edit 9/19/02.