xxxviii - 



109a. Corolla salver-form, with a very slender tube, and abruptly 



spreading lobes POLEMONIACEAE, p. 92. 



109b. Corolla salver-form, with a wide tube and fringed blue petals 



GENTIAXACEAE, p. 88. 

 109c. Corolla rotate, funnel-form, or bell-shape 



GENTIA>ACEAE, p. 88. 



HOa. Ovary deeply 4-lobed, appearing like 4 separate ovaries; 

 style 1 ' LABIATAE, p. 95, 



llOb. Ovary not 4-lobed 111. 



Ilia. Stamens 2 112. 



lllb. Stamens 3 YALERIAXACEAE, p. 111. 



lllc. Stamens 4 113. 



112a. Flowers in dense heads la, in ACANTHACEAE, p. 107. 

 112b. Flowers solitary or in loose clusters 



SCROPHULARIACEAE, p. 101. 



113a. Corolla distinctly 2-lipped and irregular 114. 

 113b. Corolla not distinctly 2-lipped, its 5 lobes all alike or nearly 

 so 115. 



114a. Calyx 2-lipped; the upper lip with 3 awl-shape teeth, the 

 lower with 2 short teeth; flowers in slender terminal spikes 



PHRYMACEAE, p. 107. 



114b. Calyx not obviously 2-lipped, its teeth equal or nearly so 



SCROPHULARIACEAE, p. 101. 



115a. Flowers sessile or nearly so, in spikes 116. 



115b. Flowers in nodding pairs at the top of a slender stalk 



3a, in CAPRIFOlIACEAE, p. 109. 



115c. Flowers solitary or in clusters; not in spikes or nodding pairs 

 117. 



116a. Corolla not over 1 cm. long . YERBENAfEAE, p. 99. 

 116b. Corolla 1.5 cm. long or more 



SCROPHULARIACEAE, p. 101. 



117a. Calyx-lobes 15 25 mm. long; flowers blue, 3 5 cm. long; calyx 

 without an obvious tube 2, in ACANTHACEAE, p. 107. 



117b. Calyx-lobes united below into an obvious calyx-tube 



SCROPHULARIACEAE, p. 101. 

 118 



118a. Leaves deeply lobed, compound, or dissected 119. 

 118b. Leaves simple and not deeply lobed 129. 



119a. Leaves once-pinnately compound or lobed 120. 

 119b. Leaves once-palmately compound or lobed 124. 

 119c. Leaves dissected or 2 3 times compound 125. 



120a. Leaves merely lobed 121. 



120b. Leaves actually compound 123. 



