Children (51 direct children, 94 direct and indirect children):
Horkelia bolanderi
(tree size 1)
Border horkelia
Horkelia clevelandii
(tree size 2)
Cleveland's horkelia
Horkelia hendersonii
Henderson's horkelia
Horkelia hispidula
White mountain horkelia
Horkelia rydbergii
Rydberg's horkelia
Horkelia marinensis
Point reyes horkelia
Horkelia parryi
Parry horkelia
Horkelia tenuiloba
Santa rosa horkelia
Horkelia sericata
Silky horkelia
Horkelia tridentata
(tree size 4)
Threetooth horkelia
Horkelia truncata
Ramona horkelia
Horkelia capitata
Horkelia californica
(tree size 7)
California horkelia
Horkelia daucifolia
(tree size 5)
Carrotleaf horkelia
Horkelia cuneata
(tree size 6)
Wedgeleaf horkelia
Horkelia fusca
(tree size 13)
Pinewoods horkelia
Horkelia tularensis
Kern plateau horkelia
Horkelia baileyi
Horkelia howellii
Horkelia kingii
Horkelia laxiflora
Horkelia micheneri
Horkelia muirii
Horkelia pickeringii
Horkelia utahensis
Horkelia webberi
Horkelia yadonii
Santa lucia horkelia
Horkelia wilderae
Barton flats horkelia
Horkelia congesta
(tree size 4)
Sierra horkelia
Horkelia pinetorum
Horkelia gordonii
(tree size 1)
Horkelia sect. capitatae
Horkelia brevibracteata
Horkelia brownii
Horkelia parviflora
Horkelia pseudocapitata
Horkelia flavescens
Horkelia congdonis
Horkelia purpurascens
Horkelia elata
Horkelia glandulosa
Horkelia puberula
Horkelia sect. hispidulae
Horkelia sect. parryae
Horkelia kelloggii
Horkelia tilingii
Horkelia subg. horkeliella
Horkelia argyrocoma
Horkelia sericoleuca
Horkelia caruifolia
Horkelia scandularis