Ambrosia acanthicarpa
 Mohave Co., AZ, near Kingman, Sep 2006
 

Ambrosia acanthicarpa
 Lincoln Co., NV, road to Elgin off Hwy 93, Sep 2006

Ambrosia acanthicarpa
 Inyo Co., CA,
Owens Valley, Sep 2006

Ambrosia ambrosioides
 Maricopa Co., AZ
Spjut & Marin 14582,
Feb 2002

Ambrosia artemissifolia
NM: just south of Lordsburg
Oct 2007

Ambrosia bryantii
 Vizcaíno Desert,
between Rosarito & Guerrero Negro, BCN
Spjut & Marin 6020, Apr 1980

Ambrosia camphorata
 Vizcaíno Desert, BCN
Apr 1980

Ambrosia chamissonis var. bipinnatisecta
 Big Lagoon, CA
July 2004

Ambrosia chamissonis
 Samoa Peninsula, CA
Historical collections
for cancer research

Ambrosia chamissonis
 Samoa Peninsula, CA

Ambrosia chenopodifolia
Vizcaíno Desert, BCN
Mar 1988

Ambrosia deltoidea
Along I-10, Hudspeth Co.,TX
Oct 2007

Ambrosia dumosa
Panamint Valley, CA
Spjut & Casterline15746,
Mar 2004

Ambrosia eriocentra
Mojave Desert, Cima Rd, CA
May 2006

Ambrosia eriocentra
Mojave Desert, Lovell Canyon, NV, May 2006

Ambrosia ilicifolia
Chuckwalla Mts., CA
Spjut 15736, Mar 2004

Ambrosia ilicifolia
Chuckwalla Mts., CA
Spjut 15736, Mar 2004

Ambrosia ilicifolia
Chuckwalla Mts., CA
Spjut 15736, Mar 2004

Sülsen V. P., S. I. Cazorla, F. M. Frank, F. C. Redko, C. A. Anesini, J. D. Coussio, E. L. Malchiodi V. S. Martino and L. V. Muschietti.  2007. Trypanocidal and leishmanicidal activities of flavonoids from Argentine medicinal plants.  Am. J. Trop. Med. Hyg. 77(4): 654-659. “In vitro trypanocidal and leishmanicidal activities of the flavonoids hispidulin, from Ambrosia tenuifolia, and santin, from Eupatorium buniifolium, are reported. A sensitive technique that takes advantage of ((3)H)thymidine uptake by dividing trypanosomatids has been adjusted for quantification of the parasiticidal effect of the natural products. The IC(50) values for hispidulin and santin on Trypanosoma cruzi epimastigotes were 46.7 and 47.4 muM, respectively. On trypomastigotes, the IC(50) values were 62.3 microM for hispidulin and 42.1 microM for santin. Hispidulin was more active than santin on promastigotes of Leishmania mexicana (IC(50) = 6.0 microM versus 32.5 microM). No cytotoxic activity was observed on lymphoid cells, making hispidulin and santin potential lead compounds for the development of new natural drugs. This is the first report on the trypanocidal and leishmanicidal activities of these flavonoids and on the presence of santin in E. buniifolium.”

Wang P., C. H. Kong and C. X.  Zhang.  2006. Chemical composition and antimicrobial activity of the essential oil from Ambrosia trifida L.  Molecules. 11(7): 549–555. “The essential oil obtained by steam distillation of dried aerial parts of Ambrosia trifida L. from Northeast China was analyzed by GC and GC-MS. The essential oil yield based on dried plant material was 0.12% and thirty-five compounds (corresponding to 86.7% of the total weight) were identified. The main components were: bornyl acetate (15.5%), borneol (8.5%), caryophyllene oxide (8.3%), alpha-pinene (8.0%), germacrene D (6.3%), beta-caryophyllene (4.6%), trans-carveol (2.9%), beta-myrcene (2.6%), camphor (2.4%) and limonene (3.2%). A. trifida essential oil demonstrated bactericidal and fungicidal activity against six bacterial strains and two fungal strains, using the agar diffusion method.”