6o8 



GENTIANACEAE. 



[VOL. II. 



1783. 



17-7 



:--*''' 



3. Erythraea pulchella (Sw.) Fries. 

 Branching Centaury. (Fig. 2853.) 



Gcntiana pulchella Sw. Act. Holm 1783: 84. / S, 9. 

 Gentiana ramossissima Vill. Hist. PL Dauph. 2:530. 

 Erythraea ramossissima Pers. Syn. x: 28}. 1805. 

 Erythraea pulchella Fries, Novit. 74. 1828. 



Annual, glabrous, much branched, 3 / -8 / high. 

 Leaves oval, ovate or lanceolate, the lower mostly ob- 

 tuse, 3 // -8 // long, the upper usually acutish or acute 

 and smaller; no basal tuft of leaves; flowers pink, 

 cymose-paniculate, all or nearly all of them pedicelled, 

 5"-6" long; tube of the corolla i J^-2 times longer 

 than the calyx-segments, its lobes oblong, obtuse, 

 I #"-2" long; stigma oval. 



In fields and waste places, southern New York to Penn- 

 sylvania and Maryland; also in the West Indies. Natural 

 ized from Europe. June-Si ]>t. 



4. Erythraea exaltata (Griseb.) Coville. Tall 

 or Western Centaury. (Fig. 2854.) 



Cicendia e.valtata Griseb. in Hook. Fl. Bor. Am. a: 69. 



f>l. 157. 1834. 



Erytkrata Douglasii A. Gray, Bot. Cal. x: 480. 1876. 

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



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

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

 oblong, sessile, mostly acute at both ends, s'/'-ic/'long, 

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

 axillary, all slendcr-pedicclled, 6 // -8 // long; tube of the 

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

 the lobes oblong, obtuse, i)4"-2" long. 



In sandy soil, western Nebraska to Wyoming:, Washing- 

 ton, Arizona and California. May-Sept. 



Erythraea calycdsa Huckl., a Texan species differing 

 from this in its broader larger obtuse corolla lobes, has 

 been found as a waif in Missouri. 



a. 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 4-12-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; 

 anthers linear or oblong, curved, revolute or coiled in anthesis. Ovary i-celled, the pla- 

 centae intruded; style 2-cleft or 2-parted, its lobes filiform, stigmatic along their inner sides. 

 Capsule ovoid or globose, 2-valved, many-seeded. Seeds small, reticulated. [In honor of 

 L. Sabbati, an Italian botanist.] 



About 14 species, natives of eastern North America and Mexico. Besides the following, some 

 5 others occur in the southern United States. 

 Flowers normally 4-5-parted, sometimes 6-7-parted. 

 Branches opposite. 



Style 2-parted to below the middle or nearly to the base; flowers white. 



Leaves lanceolate or ovate, acute; flowers 8"-i2" broad. i. 5". lanceolata. 



Leaves linear-oblong or lanceolate, obtuse; flowers 6" '-9" broad. 2. S. paniculata, 



Style 2-cleft to about the middle; flowers normally pink. 



Leaves linear-lanceolate, sessile; stem slightly 4-angled. 



Leaves ovate, cordate-clasping; stem strongly 4-angled. 



Branches alternate, the lower sometimes opposite in nos. 5 and 6. 



Calyx-segments fpliaceous, longer than the corolla. 



Calyx-segments linear or lanceolate, not longer than the corolla. 



Calyx-tube conspicuously 5-ribbed; flowers i'-2' broad. 



Calyx-tube scarcely ribbed; flowers I'-i Ja' broad. 



Calyx shorter than the corolla; style 2-parted. 



Flower pink with a yellow eye (rarely white); corolla-segments obovate. 



7. 5. stellaris. 

 Flowers white, very numerous; corolla-segments spatulate or oblanceolate. 



8. S. Elliollii. 

 Calyx-segments filiform, as long as the corolla; style 2-cleft. 9. S. campanulata. 



Flowers normally 8-i 2 parted, iM'-2j^' broad. 10. 5. dodecandra. 



3. S 1 . anguslifolia. 



4. S. angularis. 



5. 5. calycina. 



6. 5". campestris. 



