  | 
         plants less than 3 dm tall, usually 1-2
        dm; NOT [plants more than 3 dm tall]  | 
        | 
         plants NOT with a bluish tinge  | 
        | 
         foliage NOT spiny  | 
        | 
         plants scapose; NOT [plants with stem
        leaves]  | 
        | 
         lowest leaves (and the upper) compound;
        NOT [lowest leaves simple]  | 
        | 
         leaves much divided, with leaflets or
        segments numerous; NOT [leaves simple or divided into few well-developed
        leaflets], NOT [leaves once pinnate], NOT [leaves palmate with 5-7 large
        leaflets], NOT [foliage digitately compound], NOT [leaves usually
        trifoliolate; leaflets palmate, 10-30 cm wide]  | 
        | 
         plants lacking axillary bulblets; NOT
        [plants with axillary bulblets largely replacing flowers]  | 
        | 
         inflorescence NOT bluish  | 
        | 
         NOT [flowers in dense globose heads with
        spiny bracts]  | 
        | 
         umbel compound; NOT [umbel simple]  | 
        | 
         umbel many-flowered; NOT [umbel
        few-flowered]  | 
        | 
         involucral bracts small, slightly or not
        dissected; NOT [involucral bracts large, pinnately dissected]  | 
        | 
         flowers yellow  | 
        | 
         fruits more than 5 mm long; NOT [fruits
        3-4 mm long]  | 
        | 
         fruit oblong to elliptical; NOT [fruit
        linear to clavate]  | 
        | 
         fruit generally 3 times as long as broad
        or less; NOT [fruit several times longer than broad]  | 
        | 
         fruits flattened dorsally (at right
        angles to the styles); NOT [fruits more or less rounded in
        cross-section]  | 
        | 
         fruit winged; NOT [fruit wingless]  | 
        | 
         fruit winged on the marginal nerves only;
        NOT [fruit conspicuously winged on marginal and dorsal nerves]  | 
        | 
         fruit NOT spiny; NOT [fruit covered with
        short, hooked spines]  |