| species | acanthocarpa Engelm. & J.M. Bigelow * | 2 | |
| species | aciculata Griffiths * | | |
| species | anahuacensis Griffiths * | | |
| species | andicola Pfeiff. * | | |
| species | arcei Cárdenas * | | • |
| species | arechavaletae Speg. * | | |
| species | arenaria Engelm. * | | |
| species | argentina Griseb. * | | |
| species | arrastradillo Backeb. * | | |
| species | articulata (Pfeiff.) D.R. Hunt * | | |
| species | basilaris Engelm. & J.M. Bigelow * | 1 | |
| species | bergeriana F.A.C. Weber ex A. Berger * | | |
| species | bigelovii Engelm. * | | |
| species | boliviana Salm-Dyck * | | |
| species | brachyarthra Engelm. & J.M. Bigelow * | | |
| species | brachyclada Griffiths * | | |
| species | brachydelphys (K. Schum.) K. Schum. * | | |
| species | brasiliensis (Willd.) Haw. * | | |
| species | bravoana Baxter * | | |
| species | brittonii González Ortega, Jesús * | | • |
| species | brunneogemmia (F. Ritter) Schlindw. * | | |
| species | brunnescens Britton & Rose * | | |
| species | camuessa F.A.C. Weber * | | |
| species | cantabrigiensis Lynch * | | |
| species | chinensis (Roxb.) K. Koch * | | • |
| species | chlorotica Engelm. & J.M. Bigelow * | | |
| species | cholla F.A.C. Weber * | | |
| species | cochenillifera (L.) Mill. * | | • |
| species | compressa J.F. Macbr. * | 1 | • |
| species | conoidea (F. Ritter) G.D. Rowley * | | |
| species | cordobensis Speg. * | | • |
| species | cuija (Griffiths & Hare) Britton & Rose * | | |
| species | cylindrarticulata (Cárdenas) G.D. Rowley * | | |
| species | dactylifera Vaupel * | | |
| species | dillenii (Ker Gawl.) Haw. * | | |
| species | dimorpha C.F. Först. * | | |
| species | discata Griffiths * | | |
| species | echinocarpa Engelm. & J.M. Bigelow * | 3 | |
| species | ellemeetiana Miq. * | | |
| species | emoryi Engelm. * | | |
| species | engelmannii Salm-Dyck ex Engelm. * | 9 | |
| species | erinacea Engelm. & J.M. Bigelow * | 2 | |
| species | exaltata A. Berger * | | |
| species | ficus-indica (L.) Mill. * | | • |
| species | flexuosa (Backeb.) G.D. Rowley * | | |
| species | floccosa Salm-Dyck * | | |
| species | fragilis (Nutt.) Haw. * | 2 | |
| species | frigida (F. Ritter) G. Navarro * | | |
| species | frutescens Engelm. * | 2 | • |
| species | fulgida Engelm. * | | |
| species | glaucescens Salm-Dyck * | | |
| species | glomerata Haw. * | 1 | |
| species | gorda Griffiths * | | |
| species | gosseliniana F.A.C. Weber * | | |
| species | gracilis Pfeiff. * | | • |
| species | grandis Pfeiff. * | | |
| species | guerrana Griffiths * | | |
| species | hernandezii DC. * | | |
| species | hildemanii Frič * | | |
| species | humifusa (Raf.) Raf. * | 1 | • |
| species | hypogaea Werderm. * | | |
| species | hystricina Engelm. & J.M. Bigelow * | 1 | |
| species | ignescens Vaupel * | | |
| species | imbricata (Haw.) DC. * | | |
| species | inermis (DC.) DC. * | | |
| species | invicta Brandegee * | | |
| species | kunzei Rose * | 1 | |
| species | larreyi F.A.C. Weber ex Coult. * | | |
| species | leoncito Werderm. * | | |
| species | leptocaulis DC. * | 6 | • |
| species | leucophaea Phil. * | | |
| species | leucotricha DC. * | | |
| species | lindheimeri Engelm. * | 6 | |
| species | linguiformis Griffiths * | | |
| species | littoralis (Engelm.) Cockerell * | | |
| species | macrocentra Engelm. * | 1 | |
| species | macrorhiza Engelm. * | | |
| species | maihuen Gay * | | |
| species | marnieriana Backeb. * | | |
| species | megacantha Salm-Dyck * | | • |
| species | melanosperma Svenson * | | |
| species | mesacantha Raf. * | 1 | • |
| species | microdasys (Lehm.) Pfeiff. * | | |
| species | miquelii Monv. * | | |
| species | missouriensis DC. * | 2 | |
| species | molesta Brandegee * | | |
| species | molfinoi (Speg.) Werderm. * | | |
| species | monocantha (Willd.) Haw. * | 1 | |
| species | nicholii L.D. Benson * | | |
| species | × occidentalis Engelm. & J. M. Bigelow (pro sp.) * | 1 | |
| species | orbiculata Salm-Dyck ex Pfeiff. * | | |
| species | oricola Philbrick * | | |
| species | ovallei Gay * | | |
| species | palmeri Engelm. ex J.M. Coult. * | | |
| species | pampeana Speg. * | | |
| species | papyracantha Phil. * | | |
| species | paraguayensis K. Schum. * | | • |
| species | parishii Orcutt * | | |
| species | patagonica Phil. * | | |
| species | phaeacantha Engelm. * | 1 | |
| species | phyllanthus (L.) Mill. * | | |
| species | poeppigii Otto & Pfeiff. * | | |
| species | polyacantha Haw. * | 6 | |
| species | prolifera Engelm. * | | |
| species | puelchana A. Cast. * | | |
| species | pulchella Engelm. * | | |
| species | ramosissima Engelm. * | | |
| species | ramulifera Salm-Dyck * | | • |
| species | rhodantha K. Schum. * | | |
| species | riviereana Backeb. * | | |
| species | robusta J.C. Wendl. * | 2 | |
| species | rutila Nutt. * | | |
| species | scheeri F.A.C. Weber * | | |
| species | segethii F. Phil. * | | |
| species | semispinosa Griffiths * | | |
| species | shreveana C.Z. Nelson * | | |
| species | sphaerica C.F. Först. * | | |
| species | spinosior (Engelm.) Toumey * | | |
| species | stanlyi Engelm. ex B.D. Jacks. * | 4 | |
| species | stenopetala Engelm. * | | |
| species | stricta (Haw.) Haw. * | 1 | |
| species | subulata (Muehlenpf.) Engelm. * | | |
| species | sulphurea Gillies ex Salm-Dyck * | | |
| species | tarapacana Phil. * | | |
| species | tardospina Griffiths * | | |
| species | tessellata Engelm. * | 1 | |
| species | thurberi Engelm. * | | |
| species | tomentosa Salm-Dyck * | 1 | |
| species | tortispina Engelm. & J.M. Bigelow * | | |
| species | trichophora (Engelm. & J.M. Bigelow) Britton & Rose * | | |
| species | tunicata (Lehm.) Pfeiff. * | | |
| species | ursina F.A.C. Weber * | | |
| species | vaginata Engelm. * | | • |
| species | violacea Engelm. * | | |
| species | violacea Engelm. ex B.D. Jacks. * | 3 | |
| species | vulgaris auct. * | | • |
| species | vulgaris Mill. * | | • |
| species | vulpina F.A.C. Weber * | | |
| species | whipplei Engelm. & J.M. Bigelow * | 3 | |
| species | whitneyana E.M. Baxter * | | |
| species | wigginsii L.D. Benson * | | |
| species | wilkeana (Backeb.) G.D. Rowley * | | |
| species | wrightiana (E.M. Baxter) Peebles * | | |