Key to Amsinckia (Boraginaceae) in San Diego Co, California, U.S.A.)
(Modified from the upcoming second edition treatment of The Jepson Manual by Ron Kelley, with permission)

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1. Calyx lobes 2-4; corolla tube 20-veined near base; nutlet surface cobblestone-like, round-tubercled ................................................................ A. tessellata var. tessellata
1' Calyx lobes 5; corolla tube 10-veined near base; nutlet surface generally sharp-tubercled, often ridged
    2. Nutlet 1-2 mm; lf margin finely toothed .............................................................................................................................................................................. A. spectabilis
    2' Nutlet 2-4 mm; lf margin generally entire
        3. Corolla + constricted by hairy bulges at junction of tube and throat; stamens, style enclosed in tube .......................................................................... A. lycopsoides
        3' Corolla not constricted, open, glabrous; stamens, style exserted from tube, included in throat
            4. Corolla 10-20 mm long 8-14 mm wide at top; anthers not appressed to, generally below stigma ........................................................................... A. eastwoodiae
            4’ Corolla 4--11 mm, 1--10 mm broad; style not exserted, anthers gen appressed to stigma; not heterostylous
                5. St erect; grayish, hispid-hirsute, with also abundant shorter, softer appressed, often retrorse hairs below; lf grayish, with abundant
                    appressed ascending hairs; corolla pale yellow .......................................................................................................................................................... A. retrorsa
                5’ St erect to decumbent; green to brown, spreading hispid, +- without shorter, softer appressed hairs below; lf green, spreading hispid,
                    +- without shorter, softer appressed hairs
                    6. Corolla 7-11mm long; 4-10 mm wide, + orange generally with 5 red-orange marks; tube +- exserted from calyx ................... A. menziesii var. intermedia
                    6' Corolla 4-7 mm long; 1-3 mm wide, pale yellow, without markings; tube scarcely exserted from calyx .................................... A. menziesii var. menziesii