137b. 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 1b, 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 flowers without petals. In some of them a 3-lobed ovary with 3 styles may be plainly seen =EUPHORBIACEAE=, p. 66. 145a. Plants of the composite type, with several or many small flowerets closely aggregated into a dense head subtended by a calyx-like involucre of small bracts --146. 145b. Flowers solitary or in clusters, but not in involucred heads --147. 146a. Leaves compound with 3 leaflets; stipules present =LEGUMINOSAE=, p. 58. 146b. Stipules none =COMPOSITAE=, p. 113. 147a. Leaves compound or deeply lobed --148. 147b. Leaves simple and not deeply lobed --154. 148a. Flowers irregular =LEGUMINOSAE=, p. 58. 148b. Flowers regular --149. 149a. Petals 3 =LIMNANTHACEAE=, p. 68. 149b. Petals 4 --150. 149c. Petals 5 or more --151. 150a. Stamens 4 70a, in =ROSACEAE=, p. 57. 150b. Stamens 6 =CRUCIFERAE=, p. 42. 150c. Stamens numerous 43, in =RANUNCULACEAE=, p. 39. 151a. Flowers in heads or umbels --152. 151b. Flowers in slender spikes or racemes --153. 152a. Styles 2 =UMBELLIFERAE=, p. 80. 152b. Styles 5 =ARALIACEAE=, p. 80. 153a. Leaves ternately compound 43, in =RANUNCULACEAE=, p. 39. 153b. Leaves once-pinnately compound 50b, in =ROSACEAE=, p. 55. 154a. Flowers irregular --155. 154b. Flowers regular --156.