Status:  temporary colonist/immigrant?

Flights:  1, Jun-Sep?

Distribution/known sites in Monterey County:  recent records at Fort Ord and Big Creek Reserve

Habitats:  open woodland, forest edge, roadsides, parks, trails, gardens

Host plants:  senna (Cassia spp. - cultivated?)

Adult foodmud, flowers with long tubes - bougainvillea, hibiscus, lantana, morning glory

Conservationnone required


  1.   formerly abundant in SoCal, now mostly coastal

  2.   invades north, numbers vary annually

  3.   autumn migration some years (all die, don’t reproduce)

  4.   high, directional sailing flight with deep powerful wingbeats

  5.   male brilliant yellow; female dimorphic orange/yellow/dull white w/black cell spot, dark borders, more extensive markings


Cloudless sulphur   Phoebis sennae

Life history facts

egg: laid singly on young leaves or flower buds

larva: eats leaves, rest on underside of leaf petioles

pupa: ?

adult:  males patrol with rapid flight for receptive females