Adonis aestivalis L.
Summer Pheasant's Eye
Agave utahensis Engelm.
Utah Agave
Ageratum conyzoides L.
Tropical Whiteweed
Andropogon ternarius Michx.
Paintbrush Bluestem, Silver Bluestem, Split Bluestem, Splitbeard Bluestem
Apium graveolens L.
Wild Celery
Aralia cordata Thunb.
Udo
Argemone glauca (Nutt. ex Prain) Pope
Hawaiian Poppy, Smooth Pricklypoppy
Argemone mexicana L.
Mexican Pricklypoppy
Arthropodium cirrhatum (G. Forst.) R. Br.
Renga lily, Rock-lily
Arum italicum Mill.
Cuckoo's Pint, Italian Arum, Italian Lords And Ladies
Asclepias cordifolia (Benth.) Jeps.
Heartleaf Milkweed
Asclepias physocarpa (E. Mey.) Schltr.
Balloonplant
Asclepias speciosa Torr.
Showy Milkweed
Avena sativa L.
Common Oat
Bergenia crassifolia (L.) Fritsch
Siberian-tea
Callistephus chinensis (L.) Nees
China Aster
Camassia leichtlinii (Baker) S. Watson
Large Camas
Campanula rotundifolia L.
Bluebell Bellflower, Common Harebell