quail bush quail brush white thistle Atriplex lentiformis | spiny shrub with silvery-scurfy foliage of alkaline plains of southwestern United States and Mexico |
Russian thistle Russian tumbleweed Russian cactus tumbleweed Salsola kali tenuifolia | prickly bushy Eurasian plant, a troublesome weed in central and western United States |
prickly poppy argemone white thistle devil's fig | any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods, chiefly of tropical America |
thistle | any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves |
welted thistle Carduus crispus | European biennial introduced in North America having flower heads in crowded clusters at ends of branches |
musk thistle nodding thistle Carduus nutans | Eurasian perennial naturalized in eastern North America having very spiny white cottony foliage and nodding musky crimson flower heads, valuable source of nectar |
carline thistle | a thistle of the genus Carlina |
stemless carline thistle Carlina acaulis | stemless perennial having large flowers with white or purple-brown florets nestled in a rosette of long spiny leaves hairy beneath, of alpine regions of southern and eastern Europe |
common carline thistle Carlina vulgaris | Eurasian thistle growing in sand dunes and dry chalky soils |
star-thistle caltrop Centauria calcitrapa | Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales, naturalized in America |
Barnaby's thistle yellow star-thistle Centaurea solstitialis | European weed having a winged stem and hairy leaves, adventive in the eastern United States |
plume thistle plumed thistle | any of numerous biennial to perennial herbs with handsome purple or yellow or occasionally white flower heads |
Canada thistle creeping thistle Cirsium arvense | European thistle naturalized in United States and Canada where it is a pernicious weed |
field thistle Cirsium discolor | stout North American thistle with purplish-pink flower heads |
woolly thistle Cirsium flodmanii | thistle of western North America having white woolly leaves |
European woolly thistle Cirsium eriophorum | woolly thistle of western and central Europe and Balkan Peninsula |
melancholy thistle Cirsium heterophylum Cirsium helenioides | perennial stoloniferous thistle of northern Europe with lanceolate basal leaves and usually solitary heads of reddish-purple flowers |
brook thistle Cirsium rivulare | of central and southwestern Europe |
bull thistle boar thistle spear thistle Cirsium vulgare Cirsium lanceolatum | European thistle with rather large heads and prickly leaves, extensively naturalized as a weed in the United States |
blessed thistle sweet sultan Cnicus benedictus | annual of Mediterranean to Portugal having hairy stems and minutely spiny-toothed leaves and large heads of yellow flowers |
globe thistle | any of various plants of the genus Echinops having prickly leaves and dense globose heads of bluish flowers |
prickly lettuce horse thistle Lactuca serriola Lactuca scariola | European annual wild lettuce having prickly stems, a troublesome weed in parts of United States |
cotton thistle woolly thistle Scotch thistle Onopordum acanthium Onopordon acanthium | biennial Eurasian white hairy thistle having pale purple flowers, naturalized in North America |
golden thistle | any of several spiny Mediterranean herbs of the genus Scolymus having yellow flower heads |
milk thistle lady's thistle Our Lady's mild thistle holy thistle blessed thistle Silybum marianum | tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads, naturalized in California and South America |
sow thistle milk thistle | any of several Old World coarse prickly-leaved shrubs and subshrubs having milky juice and yellow flowers, widely naturalized, often noxious weeds in cultivated soil |
blueweed blue devil blue thistle viper's bugloss Echium vulgare | a coarse prickly European weed with spikes of blue flowers, naturalized in United States |