Arrowhead
Arrowleaf Balsamroot
Arrowleaf Buckwheat
Arrowleaf Clover
Arrowleaf Ragwort
Arrowleaf Tearthumb
Arroyo Willow
Arum
Arumleaf Arrowhead
Aruncus
Ash
Ash Penstemon
Ashland Cinquefoil
Ashland Thistle
Asian Forget-me-not
Asian Netvein Hollyfern
Asiatic Dayflower
Asiatic Tearthumb
Asparagus
Aspen Fleabane
Asphodel
Aster
Asthmaweed
Atlantic Ivy
Attenuate Indian Paintbrush
Austin Knotweed
Australian Brome
Australian Waterbuttons
Autumn Crocus
Autumn Dwarf Gentian
Autumn Olive
Avens
Awl-leaf Lilaea
Awl-leaf Pearlwort
Awl-leaf Pincushionplant
Awlfruit Sedge
Awlwort
Awned Halfchaff Sedge
Aztec Tobacco
Azure Penstemon