DICOTYLEDONOUS PLANTS 167 



b. S. as'per Vill. Erect, more robust than the preceding, with 

 leaves decidedly spiny ; the auricles of the leaves are rounded. The 

 akenes are smooth with sharp edges. This is less common than the 

 preceding. 



SUBORDER II. LABIATIFLO'RAE 



Corollas of all or only the perfect flowers 2-lipped. Recep- 

 tacle naked ; anthers with conspicuous tails ; style branches 

 short, smooth, without appendages. 



PERE'ZIA 



Herbs with alternate, rigid leaves. Flowers solitary or in 

 panicles, purple or white, all perfect. Involucre with leathery 

 scales in several ranks. Corolla with slender tube ; the outer, 

 longer lip 3-toothed ; the inner 2-toothed or 2-cleft. Anthers 

 with long, naked tails at base and a lanceolate appendage at 

 apex. Akenes usually glandular. Pappus of rough, hair-like 

 bristles. 



P. microceph/ala Gray. Stems 2-3 ft. high, branching, glandular 

 at the upper part, leafy to the top. Leaves thin, veiny, oblong to 

 ovate, clasping by a heart-shaped base ; margin with minute spine- 

 tipped teeth. Heads numerous in corymbs at the ends of the 

 panicled branches. Flowers rose-purple. This is common in south- 

 ern California, blooming in the summer and fall. 



SUBORDER III. TUBULIFLO'RJE 



Flowers tubular, the outer ones only with rays, or the ray 

 flowers entirely wanting. 



Tribe 1. EUPATORIA'CE^:. Heads without rays. Flowers 

 all perfect, never yellow. Anthers without tails. Style 

 branches club-shaped. 



I. BRICKEI/LIA 



Herbs or low shrubs, with opposite or alternate, veiny 

 leaves. Heads few- to many-flowered ; bracts of the involucre 

 somewhat papery, in regular rows, nerved with parallel rows 

 or veins. Receptacle naked. Corollas slender, 5-toothed at 



