SCROPHULARIACE^ 



373 



A. Corolla very shallow and nearly regular 1. Verbascum 



AA. Corolla very irregular, often personate. 



B. Flowers with long spur 2. Linaria 



BB. Flowers spurless, but saccate or swollen at the 



base 3. Antirrhinum 



BBB. Flowers not spurred, saccate, or much swollen. 



c. Stamens 5, hut the fifth sterile, often a scale only. 

 D. Sterile filament a little scale on th.e upper 

 side of the corolla: flowers small and dull- 

 colored 4. Scrofjhtilaria 



DD. Sterile filament elongated: corolla 2-lipped 

 E. Filament shorter than the others: the 2 

 lips of the corolla but slightly open: 



seeds winged 5. Chelone 



EE. Filament about the same length as the 

 others: corolla lip open: seeds wing- 

 less 6. Penfstemon 



DDD. Sterile filament, not conspicuous: corolla al- 

 most 2-parted, the middle lobe of the 

 lower lip keeled, enclosing the 4 stamens. 7. Collinsia 

 cc. Stamens plainly 4. 



D. Corolla 2-lipped: calyx 5-angled : flowers not 



drooping 8. MimnJus 



DD. Corolla slightly 2-Iipped, irregularly 5-lobed: 



flowers drooping 9. Digitalis 



DDD. Corolla with upper lip narrow and erect, much 

 longer than the lower, and keeled : anther- 

 sacs not alike: floral leaves colored like 



petals 10. Castilleia 



ccc. Stamens 2 (or 2 others rudimentary or want- 

 ing). 



D. Corolla 2-lipped 11. Gratiola 



DD. Corolla rotate, lobes unequal 12. Veronica 



1. VERBASCUM. Mullein. 



Tall biennials, with alternate decurrent leaves : calyx and corolla 

 5-parted, the latter shallow and nearly or quite rotate: stamens 5, some or 

 all of the filaments woolly. 



V. ThApsus, Linn. Common mullein. Figs. 22, 133. Two to 5 ft., stout 

 and usually unbranched, white-woolly: leaves oblong and acute, felt-like: 

 flowers yellow, in a very dense spike. Weed from Europe. 



V. Blattiria, Linn. Moth mullein. Slender and branching, green and 

 nearly smooth: leaves oblong, serrate, often laterally lobed, somewhat clasp- 

 ing: flowers yellow or cream-colored, in a loose raceme. Weed from Europe. 



2. LINARIA. Toad-Flax. 



Low herbs, of various habit: corolla personate, the throat nearly or 

 entirely closed, spurred from the lower side: stamens 4: capsule opening 

 by apical pores. 



