GENUS I. 



GENTIAN FAMILY. 



4. Centaurium exaltatum (Griseb.) W. F. Wight. 

 Tall or Western Centaury. Fig. 3333. 



Cicendia exaltata Griseb. in Hook. Fl. Bor. Am. 2 : 69. pi. 157. 

 1834. 



Erythraea Douglasii A. Gray, Bot. Cal. i : 480. 1876. 

 Erythraea exaltata Coville, Contr. Nat. Herb. 4: 150. 1893. 

 C. exaltatum W. F. Wight, Contr. Nat. Herb, n : 449. 1906. 

 Annual, erect, glabrous, branched, 6'-i8' high, the 

 branches few, erect, slender. Leaves oblong or linear- 

 oblong, sessile, mostly acute at both ends, 5"-io" long, 

 distant, the basal not tufted; flowers few, terminal and 

 axillary, all slender-pedicelled, 6"-8" long; tube of the 

 corolla about one-third longer than the calyx-segments, 

 the lobes oblong, obtuse, ii"-2" long. 



In sandy soil, western Nebraska to Wyoming, Washington, 

 Arizona and California. May-Sept. 



5. Centaurium texense (Griseb.) Fernald. 

 Texan Centaury. Fig. 3334. 



Erythraea texensis Griseb ; Hook. Fl. Bor. Am. a : 58. 



1838. 

 C. texense Fernald, Rhodora 10 : 54. 1908. 



Annual, corymbosely branched above, slender, 2'-8' 

 high. Stem-leaves linear or linear-lanceolate, 8" 

 long or less, acute, sessile, the upper ones reduced 

 to subulate bracts ; pedicels slender, as long as the 

 calyx or longer ; calyx 4"-s" long, its lobes subulate ; 

 corolla light rose color, its tube longer than the 

 calyx, its acute oblong to oblong-lanceolate lobes 

 about half as long as the tube; capsule longer than 

 the calyx. 



In rocky soil, Missouri to Texas. May-Sept. 



6. Centaurium calycosum (Buckley) Fernald. Buck- 

 ley's Centaury. Fig. 3335. 



Erythraea calycosa Buckley, Proc. Acad. Phil. 1862: 7. 1863. 

 Centaurium calycosum Fernald, Rhodora 10 : 54. 1908. 



Annual, corymbosely branched or sometimes simple, 2 high 

 or less, the branches ascending or spreading. Leaves oblong 

 to spatulate or linear, -i long, acute, sessile; pedicels as 

 long as 1 the calyx or longer; calyx 4"-s" long, its lobes nar- 

 rowly linear; corolla pink, its tube a little longer than the 

 calyx, its oval or oblong obtuse lobes nearly as long as the 

 tube. 



In wet or moist soil, Missouri to Texas, Mexico and New Mexico. 

 April-June. 



2. SABBATIA Adans. Fam. PI. 2: 503. 1763. 



Annual or biennial erect usually branched glabrous herbs, with opposite or sometimes 

 verticillate sessile or rarely petioled or clasping leaves, and rather large terminal and solitary 

 or cymose pink rose or white flowers. Calyx 4-i2-parted or -divided, the tube campanulate, 

 sometimes very short, the lobes or segments usually narrow. Corolla rotate, deeply 4-12- 

 parted. Stamens 4-12, inserted on the short tube .of the corolla; filaments filiform, short; 



