FAMILY KEY 25 



SS. Stem 5-angled; flowers solitary in the leaf axils; fruit dry, a capsule. 



Ly thrum in LYTHRACEAE (p. 156) 

 QQ. Leaves palmately veined, entire or not. 



T. Leaves 4-13 mm. long, cuneate at base, deeply 3-lobed, the lobes 2~4-cleft; 

 stipules large, 2-5-cleft; stem 2-20 cm. long. Alchemilla in ROSACEAE (p. 125) 

 TT. Leaves longer, either not cuneate at base or not deeply lobed; stipules entire 

 or none; stem often longer. 



U. Leaves mostly in a basal tuft; stipules present; flowers in spikes or panicles; 

 calyx lobes less than i cm. long; stamens 5; ovary i-2-celled; stem without 

 ginger taste. Heuehera in SAXIFRAGACEAE (p. 118) 



UU. Leaves from an elongated creeping stem; stipules none; flowers solitary in 

 the leaf axils; calyx lobes 2-6 cm. long; stamens 12; ovary 5-celled; stem 

 with ginger taste. ARISTOLOCHIACEAE (p. 79) 



GROUP 17 Dicotyledonous herbs with alternate simple 

 leaves and polypetalous flowers with numerous stamens 



A. Leaves tubular or pitcher-shaped, 2-6 dm. long. SARRACENIACEAE (p. 116) 



AA. Leaves not tubular nor pitcher-shaped, mostly less than 2 dm. long. 

 B. Leaves either peltate or else rounded or ovate, 10 cm. or more wide, entire* 

 mostly floating. NYMPHAEACEAE (p. 94) 



BB. Leaves not peltate, often not rounded or ovate, never so wide, often entire, 

 mostly not floating. 

 C. Leaves entire. 

 D. Pistils more than i. 



E. Flowers solitary or scattered; petals with a pit on the inside; calyx of 5-6 

 distinct sepals; stamens on the receptacle. RANUNCULACEAE (p. 95) 



EE. Flowers in spikes or panicles; petals without pit; calyx 5-cleft; stamens 

 on the calyx tube. Petrophytum in ROSACEAE (p. 125) 



DD. Pistil only i. 



F. Annual; leaves 2-6 mm. long, linear; petals 6; plants 2-5 cm. high. 



Canbya in PAPAVERACEAE (p. 104) 



FF. Annual or perennial; leaves longer, sometimes linear; petals rarely 6; 

 plants mostly taller. PORTULACACEAE (p. 86) 



CC. Leaves not entire. 

 G. Pistils more than i. 

 H. Stamens on the receptacle; sepals distinct; stipules none. 



RANUNCULACEAE (p. 95) 

 HH. Stamens on the calyx tube; sepals united at base; stipules present. 



ROSACEAE (p. 125) 

 GG. Pistil only i. 



I. Leaves palmately veined; sepals distinct. MALVACEAE (p. 150) 



II. Leaves pinnately veined; sepals united at base. 



J. Stipules adnate to the petiole; stamens 5-10; stigma i. 



Horkelia in ROSACEAE (p. 125) 

 JJ. Stipules none; stamens numerous; stigmas 3. LOASACEAE (p. 155) 



