SCKOPHULARIACE^E 



405 



ddd. Sterile filament, not conspicuous: corolla almost 

 2-parted, the middle lobe of the lower lip 



keeled, inclosing the 4 stamens 7. Collinsia 



cc. Stamens plainly 4. 



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



drooping 8. Mirmdus 



dd. Corolla slightly 2-lipped, irregularly 5-lobed 



flowers drooping 9. Digitalis 



ddd. Corolla with upper lip narrow and erect, much 

 longer than the lower, and keeled: anther- 

 sacs are not alike: floral leaves colored like 



petals 10. Castilleja 



ccc. Stamens 2 (or 2 others rudimentary or wanting). 



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 

 SS^i *H*»j> rotate ; stamens 5, some or all of the filaments woolly. 



V. Thapsus, Linn. Common mullein. Fig. 147. 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. Blattaria, Linn. Moth mullein. Slender and branch- 

 Linaria vulgaris. i n K> green and nearly smooth: leaves oblong, serrate, often 

 laterally lobed, somewhat clasping: 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. 



L. vulgaris, Mill. Toad-flax. Butter-and-eggs. Figs. 

 227, 281, 544. Common perennial weed (from Europe), 1- 

 2 ft., with linear leaves and yellow flowers in racemes. 



L. Cymbalaria, Mill. KenHworth ivy. Fig. 545. Trail- 

 ing: leaves orbicular, 5-7-lobed: flowers solitary on long 

 peduncles, lilac-blue. Europe; very common in 

 greenhouses and sometimes runs wild. 



L. canadensis, Dumont. Common annual 

 or biennial in dry or sandy soil: flowering sterna 

 slender and erect, generally simple and few- 

 leaved: also prostrate shoots, more leafy: leaves 

 narrow, flat, entire, sessile, opposite or whorled: 

 flowers small, blue, in a terminal, loose, slender 

 raceme. 545. Linaria Cymbalaria. 



