144 GENTIAN ACE.fi. 



2. ERYTH'R-fla A Renealm. 



Corolla-lobes 1% to 2 lines long; tube much longer: anthers oblong ............. 1, 2, 8 



Corolla-lobes 3 to 6 lines long: tube a little longer; anthers linear ................ 4, 6 



1. E. floribunda, Benth. Pedicels short or none: corolla-lobes 2 lines long or less. 



2. E. Muhlenbergii, Griseb. Pedicels short or 2-bracted; corolla-lobes obtuse. 



3. E. Douglasii, Gr. Pedicels slender: corolla-lobes obtuse: seeds globular. 



4. E. trichantha, Griseb. Flowers often corymbose, some sessile, lobes acute. 



5. E. venusta, Gr. Flowers pediceled: corolla-lobes obtuse, tube yellowish, 



3. GENTIANA, Tournefort. 



a. Corolla without plaited folds or appendages between the lobes. 



Flowers solitary on terminal peduncle, 12 to 18 lines long ................. ...... 1, 2 



Flowers several, smaller, 5 to 7 lines long: calyx 5-cleft ............................ 3 



6. Corolla with folds between the (usually 5) lobes which are prolonged into thin teeth or 

 accessory lobes; stigmas distinct: pod on a stipe. 



Annual: anthers introrse: stem leaves ovate-cordate 2 to 4 lines long ................. 4 



Perennial: anthers more or less extrorse: usually a pair of bracts or leaves under the short 

 peduncled or sessile flower. 

 Steins several from one caudex, 1-2- flowered: stem-leaves connate-sheathing. 



Stems 1 -flowered, 2 to 4 inches high: radical leaves rosulate ..... ......... 5 



Stems longer: upper pair of leaves enclosing the flower ................ 6, 7 



Stems many-leaved: style manifest, corolla blue or bluish. 



Corolla-lobes broad, narrowed at base; accessory lobes entire ........... 8, 9 



Corolla-lobes not narrowed at base: accessory lobes laciniate ......... 10, 11 



1. O. serrata, Gunner, var. holopetala, Gr. Calyx angular, lobes keeled. 



2. G. simplex, Gr. Leaves linear-oblong, 3 to 9 lines long: calyx hardly angular. 



3. G. Amarella, L. var. acuta, Engelm. Stem acute-angled: capsule sessile. 



4. G. Douglasiana, Bong. Cymosely branched: radical leaves rosulate. 



5. G. Newberryi, Gr. Radical leaves obovate to spatulate: corrolla 18 lines long. 



6. G. setigera, Gr. Stems decumbent: 1 or 3 bristles between corolla-lobes. 



7. G. calycosa, Griseb. Stems erect: accessory corolla-tubes laciniate or 2-cleft. 



8. G. Menziesii, Griseb. Stems slender, a ft. long or less: leaves 1 in. long or lees 

 . G. sceptrum, Griseb. Stem 2 to 4 ft. high: leaves broader, 1 to 3 in. long. 



10. G. Oregana, Engelm. Corolla over an inch long, lobes roundish. 



11. G. afflnis, Griseb, Corolla an inch long or less, lobes ovate, acute. 



4. FRASERA. Walter. 

 Stout, 2 to 5 ft. high: leaves not white margined ........................... ..... 1, 2 



Gray -green, 1 to 3 ft. high: leaves with cartilaginous white margins. ........... 3, 4, 6 



1. F. thy rsifiora, Hook. Leaves in 2's or 3's: a gland on each corolla-lobe. 



