Peavine, Emory Loco (Astragalus
emoryanus)
 Annual legume with a slender taproot and slender
stems growing close to the ground.
 Toxic agents are myserotoxin and 3-nitro-1-propanol.
Toxic to cattle, sheep and goats.
Woolly Loco, Purple Loco
 Stout, many-branched perennial legume.
 Toxic to cattle, sheep, goats and particularly horses. Toxin is
swainsonine, which causes enzyme dysfunction resulting in
damage to the brain, liver, digestive organs, placenta and
testes.
Garboncillo, Rattleweed (Astragalus
wootonii)
 Also called Wooton loco,
much-branched annual
legume with erect, hairy
stems.
 Toxic is swainsonine.
Horses are particularly
susceptible to garboncillo,
cattle, sheep and goats may
also develop garboncillo
poisoning.
Mesquite
 Small to medium-height
tree or shrub, thorny
and single stemmed or
branching near the
ground.
 Mesquite beans
primarily affect cattle,
although goats also
have been affected.
Twinleaf Senna (Senna roemeriana)
 Also called Roemer
senna, an erect, gray
perennial herb covered
with short, soft hairs.
 The toxin involved is
unknown, primarily to
cattle, goats and
probably horses.
Sheep are highly
resistant.
Texas Mountain Laurel, Mescal Bean
(Sophora secundiflora)
 Mescal bean is a woody
evergreen shrub less than
10’ tall or, in limited areas, a
tree up to 35’ tall.
 Toxic agent are quinolizidinestructured alkaloids in
mescal bean. Sheep and
goats are poisoned under
range conditions, cattle have
been susceptible in feeding
experiments.
Flowers and fruit