Hackelia (stickseeds) is a genus of plants in the borage family, Boraginaceae. It includes 54 species found in North America, western South America, temperate Eurasia, and Australia. 12 species are native to California.

The genus was named after Josef Hackel, a Czech botanist. The common name, stickseed, refers to the tendency of the barbed nutlets to stick to animal fur.

Species
54 species are currently accepted:
 Hackelia amethystina  - amethyst stickseed – California
 Hackelia andicola  – Peru
 Hackelia bella  - greater showy stickseed – northwestern California and southwestern Oregon 
 Hackelia besseyi  - Bessey's stickseed – Arizona, Colorado, New Mexico and Texas
 Hackelia bhutanica  – eastern Nepal to northwestern Arunachal Pradesh
 Hackelia brachytuba  – Nepal to central China
 Hackelia brevicula  - Poison Canyon stickseed – eastern California
 Hackelia californica  - California stickseed – northern California and west-central Oregon 
 Hackelia ciliata  - British Columbia, Idaho, and Washington
 Hackelia cinerea  - gray stickseed – Washington, Idaho, and Montana
 Hackelia cronquistii  - Cronquist's stickseed – Oregon and Idaho
 Hackelia cusickii  - Cusick's stickseed – Oregon, northern California, and northwestern Nevada
 Hackelia davisii  – Idaho
 Hackelia deflexa  – northern Eurasia and northern North America
 Hackelia difformis  – south-central China and Tibet
 Hackelia diffusa  - Spreading stickseed – British Columbia, Washington, Oregon
 Hackelia floribunda  - manyflower stickseed – western and central Canada and United States
 Hackelia gracilenta  – Colorado
 Hackelia heliocarpa  – Mexico (Chihuahua)
 Hackelia hendersonii  – Washington, Oregon, and Montana
 Hackelia hintoniorum  – Mexico (Oaxaca)
 Hackelia hirsuta  – New Mexico
 Hackelia hispida  - showy stickseed – Washington, Oregon, Idaho
 Hackelia ibapensis  – Utah
 Hackelia latifolia  – eastern Australia and Tasmania
 Hackelia leonotis  – northeastern and central Mexico
 Hackelia macrophylla  – northern Pakistan and western Himalaya
 Hackelia meeboldii  – western Himalaya
 Hackelia mexicana  – Mexico to Venezuela and Peru
 Hackelia micrantha  - Jessica sticktight – western Canada and United States
 Hackelia mundula  - pink stickseed – southwestern Oregon to central California
 Hackelia murgabica  – Tajikistan
 Hackelia nervosa  - Sierra stickseed – California and northwestern Nevada
 Hackelia obtusifolia  – Bhutan
 Hackelia ophiobia  – southeastern Oregon, southwestern Idaho, and northern Nevada
 Hackelia parviflora  – Peru (Junín)
 Hackelia patens  - spotted stickseed – west-central United States
 Hackelia pinetorum  – Arizona, New Mexico, Texas, and northern Mexico
 Hackelia popovii  – Tajikistan
 Hackelia rattanii  – Mexico (Baja California)
 Hackelia revoluta  – Colombia to northwestern Argentina
 Hackelia sessilifructa  – Xinjiang
 Hackelia setosa  - bristly stickseed – northern California and southwestern Oregon
 Hackelia sharsmithii  - Sharsmith's stickseed – central California and central Nevada
 Hackelia skutchii  – Guatemala and Costa Rica
 Hackelia stewartii  – northern Pakistan and western Himalaya
 Hackelia stricta  – southwestern Mexico to Veracruz
 Hackelia suaveolens  – eastern and southern Australia and Tasmania
 Hackelia taylorii  – Washington
 Hackelia uncinata  – northeastern Pakistan to Himalaya and southern China
 Hackelia ursina  – southeastern Arizona, southwestern New Mexico, and northern Mexico (Sonora)
 Hackelia velutina  - velvet stickseed – north-central and central California and northwestern Nevada
 Hackelia venusta  - lesser showy stickseed – central Washington
 Hackelia virginiana  - beggar's lice – central and eastern United States and eastern Canada

References

External links
USDA Plants Profile
Calflora Database: Hackelia species index in California
Jepson Manual eFlora (TJM2) treatment of Hackelia in California

 
Boraginaceae genera