FLOWERING PLANTS AND FERNS OF ARIZONA 00 



73. Petals not more numerous than the sepals, the latter 

 usually more than 2 (74). 

 74. Stamens usually more than 10; petals yellow or 

 salmon-colored (75). 

 75. Style 1; fruit a long slender 2-valved pod; leaves 

 not punctate 73. Tiliaceae. 



75. Styles 3; fruit a short capsule, 3-celled or the 



ovary with 3 placentae; leaves glandular- 

 punctate 76. Hypericaceae. 



74. Stamens 10 or fewer (76). 



76. Stamens 6, tetradynamous (2 shorter, 4 longer, 



barely so in genus Stanley a); fruit a 2-valved 

 pod or, if 1-celled, then flat, indehiscent, and 



containing a single seed 46. Cruciferae. 



76. Stamens commonly 10, 5, or fewer, not tetra- 

 dynamous (77). 

 77. Ovary 1-celled; plants not aquatic; petals often 

 notched or cleft ___ 40. Caryophyllaceae. 

 77. Ovary 2- to 5-celled; plants semiaquatic; petals 

 entire 77. Elatixaceae. 



Series 3. Gamopetalae 



Key to the families 



1. Corollas (or some of them) distinctly irregular (2). 

 2. Stamens with the filaments or the anthers connate, or the filaments not 

 attached to the corolla (3). 

 3. Ovary superior; anthers separate (4). 



4. Leaves compound (rarely reduced to 1 leaflet); stamens commonly 10; 

 petals usually 5; fruit a 2-valved pod 54. Legtjminosae. 



4. Leaves simple; stamens 6 or 8; petals 3; fruit a flat 2-celled capsule. 



63. POLYGALACEAE. 



3. Ovary inferior; stamens 4 or 5, the anthers separate or united (5). 



5. Flowers not in heads; involucre none; calyx limb well developed; fruit a 



turgid many-seeded capsule: Subfamily Lobelioideae. 



120. Campaxulaceae. 

 5. Flowers in dense heads subtended by an involucre; calyx limb reduced 

 to bristles, scales, teeth, etc.; fruit a 1-seeded achene. 



121. Compositae. 

 2. Stamens separate from one another, the filaments attached to the tube or 

 the throat of the corolla (6). 

 6. Ovary inferior; leaves opposite (7). 



7. Calyx limb obsolete; corolla bearing a well-developed spur; plants 

 herbaceous; fruit achenelike: Genus Plectritis. 



118. Valeriaxaceae. 



7. Calyx limb well developed; corolla not spurred, the tube sometimes 



gibbous on one side; stems woody; fruit a berry. 



117. Caprifoliaceae. 

 6. Ovary superior (8). 



8. Fruit at maturity separating into 2 or 4 dry nutlets or, if a fleshy drupe, 



then the flowers in headlike clusters (9). 

 9. Ovary entire or longitudinally grooved; style apical; fruit of nutlets 

 or drupelike; corolla only slightly irregular. 



107. Verbexac fae. 



9. Ovary 4-lobed, the style rising between the lobes; fruit of nutlets; 



corolla nearly regular to strongly bilabiate 108. Labial \e. 



8. Fruit not separating into nutlets; fruit a capsule, this somewhat fleshy 

 and partly indehiscent in genus Marty nia (10). 



10. Plants root parasites without chlorophyll, the leaves reduced to 



fleshy scales 113. Orobanchace \k. 



10. Plants not or weakly parasitic, with chlorophyll; leaves with well- 

 developed blades (11). 

 11. Anther-bearing stamens 5; capsule usually 3-celled. 



104. Polemoni \ceae. 



