396 monograph of the british species of euphrasia. 



Grandiflor^. 

 11. E. Rostkoviana Hayne. 12. E. camj)estris Jord. 



Angustifoli^. 

 13. E. Salisbiirgensis Funk. 

 Hybrids. 

 E. Rostkoviana x nemorosa E. gland id if/ era Wetts. 

 E. Rostkoviana x brevipila E. notata Towns. 

 E. gracilis x brevipila E. difformis Towns. 



E. occidentalis x brevipila E. pratiuscnla Towns. 

 E. brevipila x Scotica E. veniista Towns. 



E. Scotica X gracilis E. electa Towns. 



Clavis analytica.''' 

 [Bractese saltern in margine basin versus pilis glanduliferis 

 1 \ obsitfe, saepe tota3 pilis glanduliferis plus minus obtectae 2 

 (Bracteas nunquam pilis glanduliferis obsitfe ... 6 

 pf Corolla 10-15 mm longa, fine anthesis tubo elongato . 8 



I Corolla 4-10 mm longa, fine anthesis tubo nou elongato . 4 

 'Kami infra medium caulis abeuntes. Folia caulina acuta, 

 densiuscula, pilis glanduliferis longis obtecta. Floret 

 jjj ab Julio ad Octobrem . . . E. Rostkoviana Hayne. 

 1 Rami infra et supra medium caulis abeuntes. Folia 

 caulina acuta, densiuscula. Pili glanduliferi breviusculi. 

 \ Floret ab Juni usque ad Octobrem . (E. campestris Jord.) 

 Bracte^e non sensim in basin attenuatas .... 5 

 Bracteae sensim in basin cuneato-attenuatte, setis robustis 

 obsitte bine inde eglandulosae. Species arctica fere 

 circumpolaris ..... {E. latifolia Pursh.) 

 Caulis plerumque infra medium ramosus 5-35 cm altus. 

 Spica mox valde elongata. Folia caulina obtusa vel 

 acuta. Bracteae ovatae aut basi breviter cuneatae, denti- 

 bus cuspidatis vel aristatis. Corolla 5-10 mm longa 

 violascens vel albida. Capsula cuneato-obovata, calycem 

 aequans vel superans . . E. brevipila Burn, et Grem. 

 Caulis infra medium ramosus. Spica non elongata densa. 

 Corolla 4-6 mm longa albida vel cferulea ? Bractese dense 

 imbricatae acutas, dentibus acutis. Capsula elliptica 

 calycem aequans vel excedens . . E. occidentalis Wettst. 

 rFoliorum caulinorum superiorum lanceolata vel lanceolato- 

 ovata longitudo latitudinem (exclusis dentibus) in minimo 

 duplo superat plerumque valde superat. Corolla 6-8 mm 

 longa alba, labio superiore caerulesceute vel violascente 

 rarius totae lilacinae, Capsulje maturae margine glabrae 

 vel pilis sparsis inflexis obsitae . E. Salisburgensis Funck. 

 Foliorum caulinorum superiorum longitudo latitudinem 

 (exclusis dentibus) in maximo duplo superans, plerumque 

 brevior. Capsulae maturae margine pilis strictis erectis 

 obsitae .......... 7 



* The dimensions throughout are metrical. 



6 



