xxvi 



37a. Flowers greenish or brownish, without obvious colored petals 



38. 

 37b. Flowers with conspicuous white or colored petals 39. 



38a. Each flower with 6 small chaffy petals 



4, in JUNCACEAE, p. 10. 



38b. Petals none; each flower in the axil of a single chaffy bract 



2a, in CYPERACEAE, p. 7. 



39a. Flowers regular 34a, in LILIACEAE, p. 11. 



39b. Flowers irregular lOa, in ORCHIDACEAE, p. 16. 



40a. Stem erect, unbranched or with one or two branches only 



41. 

 40b. Stem freely branched 42. 



41a. Plants of moist soil, with opposite scales; corolla regular, with 

 4 petal-like lobes la, in GENTIANACEAE, p. 88. 



41b. Swamp plants, with a few alternate scales; corolla irregular 



LENTIBULARIACEAE, p. 105. 



42a. Leaves numerous and close, concealing the stem 



2a, in CISTACEAE, p. 74 

 42b. Leaves spreading, not concealing the stem 43. 



43a. Leaf-scales in small clusters; flowers greenish, with 6 petals 



2a, in LILIACEAE, p. 10. 

 43b. Leaf-scales distinctly opposite; petals 5, yellow 



la, in HYPERICACEAE, p. 74. 



44a. Sepals 2 3, in PORTULACACEAE, p. 34. 



44b. Sepals 4 or 5 CRASSULACEAE, p. 48. 



45a. Leaves pitcher-shape, open at the top 



SARRACENIACEAE, p. 48. 

 45b. Leaves tubular, closed at the end 37b, in LILIACEAE, p. 13. 



