xl 



131a. Flowers axillary, solitary or in few-flowered clusters 132. 

 131b. Flowers in terminal, or terminal and axillary clusters 138. 



132a. Leaves linear CHENOPODIACEAE, p. 28. 



132b. Leaves of a broader shape than linear 133. 



133a. Flower-clusters with bracts as long as or longer than the 



flowers 134. 

 133b. Flowers without conspicuous bracts 135. 



134a. Leaves broadest below the middle 



8a, in TJRTICACEAE, p. 24. 

 134b. Leaves broadest above the middle 



2, in AMARANTHACEAE, p. 30. 



135a. Principal leaves 3 cm. long or more 136. 

 135b. Principal leaves 2.5 cm. long or less 137. 



136a. Flowers nodding in the axils of the leaves 



la, in YIOLACEAE, p. 75. 

 136b. Flowers erect in the axils 2a, in ONAGRACEAE, p. 78. 



137a. Leaves narrowly oblong la, in HALORAGIDACEAE, p. 79. 

 I37b. Leaves roundish and somewhat heart-shape 



12a, in SAXIFRAGACEAE, p. 50. 



138a. Flowers in racemes or simple spikes 139. 



138b. Flowers in panicles or other branched clusters 141. 



139a. Leaves toothed or lobed 52b, in CRUCIFERAE, p. 46. 



139b. Leaves entire 140. 



140a. Flowers sessile; leaves heart-shape PIPERACEAE, p. 19. 

 140b. Flowers pedicelled; leaves obovate 



8b, in PRIMULACEAE, p. 87. 



141a. Individual flowers distinct from each. other, on pedicels 142. 

 141b. Individual flowers crowded in close clusters, or separate and 

 sessile 143. 



142a. Leaves finely serrate 3b, in CRASSULACEAE, p. 49. 



142b. Leaves entire Ib, in CISTACEAE, p. 74. 



143a. Flower-clusters mingled with sharp-pointed bracts 



AMARANTHACEAE, p. 30. 



143b. Flower-clusters without bracts, or (rarely) with bracts which 

 are not sharp-pointed CHENOPODIACEAE, p. 28. 



144 



144a. Juice not milky 145. 



144b. Juice milky; apparent flowers consisting of a few white 

 or colored petal-like bracts, inclosing a few inconspicuous flow- 

 ers without petals. In some of them a 3-lobed ovary with 3 

 styles may be plainly seen EUPHORBIACEAE, p. 66. 



