86 



GENTIANACEAE 



Locs. — S. Cal.: La Jolla, Evelyn Gray (fls. sometimes white) ; Mesa Grande, San Diego Co., 

 E. Ferguson 124; Eseondido, C. V. Meyer 131; Indian Caiion, Collins Valley, ne. San Diego Co., 

 Jepson 8844 ; Glendale, Braunton 890 ; Lower Rubio Canon, San Gabriel Mts., Peirson 144 ; San 

 Bernardino, Parish 4193 ; Palm Canon, Mt. San Jacinto, Jepson 1366 ; Palo Verde, e. Riverside 

 Co., Hall 5915; Victorville, Parish; Ojai Valley, Olive Thacher. Sierra Nevada: Kemville, Pur- 

 pus 5652; Kaweah, Jepson 562; Orange Cove, Fresno Co., Hoover 1272; McKinley Grove., A. L. 

 Grant 1194; Mono Hot Sprs., Fresno Co., A. L. Grant 1497; Auberry, Fresno Co., Jepson 12,882; 

 Arnold Mdw., Madera Co., A. L. Grant 1355 ; Yosemite, Jepson 3129 ; Hetch-Hetehy, Jepson 3466 ; 

 Rancheria Mt., Tuolumne Co., Jepson 4606; Burson, Calaveras Co., Jepson 9936; Buena Vista, 



Amador Co., Jepson 9960a ; Table Mt., Oroville, Heller 

 10,778. Inner North Coast Range foothills: Mud 

 Flat, sw. of Paskenta, Tehama Co., Heller 11,523; 

 Olinda, Shasta Co., BlanMnship; Redding, BlanTcin- 

 ship. 



Refs. — Centaukium vendstdm Rob., Proc. Am. 

 Acad. 45:397 (1910); Jepson, Man. 762, fig. 743 

 (1925). Erythraea veniisia Gray, Bot. Cal. 1:479 

 (1876), type from Cal. E. cMronioides Torr., Bot. 

 Mex. Bound. 156, pi. 42 (1859), in part. 



6. C. trichanthum Rob. Alkali Cen- 

 taury. Stem eorymbosely and rather densely 

 branched, 3 to 9 (or 12) inches high, com- 

 monly with numerous usually crowded flow- 

 ers; flowers sessile in the forks, and sessile 

 along the branches or shortly pediceled ; leaf- 

 blades broadly oblong and usually acute to 

 lanceolate, ^/o to 1 inch long; corolla pink, usu- 

 ally with whitish throat, 6 to 9 lines long, its 

 lobes oblong, acute, becoming narrow in age 

 by involution and thus very acuminate, 2% 

 to 3 lines long; style not branched, the stigmas 

 short, transversely oblong. 



Dry often alkaline ground, 100 to 1600 (or 

 2600) feet: Santa Cruz Mts. to Siskiyou Co. 

 May-Aug. 



Locs. — Belmont, Davy 778 ; Howell Mt., Jepson 

 6836; Calistog.a, Jepson 7438; betw. Samuels Sprs. 

 and Aetna Sprs., Napa Co., Jepson 14,638; Butts 



Canon, n. of Pope Valley, Napa Co., Jepson 14,633 ; Devil's Gate, Putah Creek, Jepson 14,636 ; 



Knoxville grade to Lower Lake, Jepson 14,631 ; Yreka, Sutler 1020. 



Refs. — Centauetom tkichanthum Rob., Proc. Am. Acad. 45:397 (1910) ; Jepson, Man. 762 



(1925). Erythraea trichantha Griseb., Gen. et Sp. Gent. 146 (1839), type from Cal., Douglas; 



Jepson, Fl. W. Mid. Cal. 379 (1901), ed. 2, 320 (1911). 



Fig. 328. Centaukium venustuji Rob. 

 o, habit, X % ; b, long. sect, of corolla, 

 X 1% ; c, pistil, X 1% ; d, cross sect, of 

 ovary, X 8. 



3. EUSTOMA Salisb. 



Ours a glaucous perennial herb. Flowers blue or white, long-peduncled, axil- 

 lary and terminal, 5 or 6-merous. Calyx-lobes long-acuminate, keeled. Corolla 

 eampanulate-f unnelf orm, its lobes more or less erose-denticulate. Stamens inserted 

 on the throat of the corolla; anthers straight or recurving in age. Style filiform. 

 Capsule oval to oblong. — Species 3, North and South America. (Greek eu, good, 

 and stoma, mouth, the corolla throat large.) 



1. E. exaltatum Griseb. Mock Gentian. (Fig. 329.) Erect, 1 to 21/2 feet 

 high; leaf-blades broadly oblong, 1% to 3 inches long, thickish, sessile, subcordately 

 clasping; flowers 1 to 11^4 inches long, on peduncles 1 to 3^/4 inches long; corolla blue 

 or deep lavender, 1 to 1^4 inches long, its lobes obovate or oblong, 9 to 10 lines long, 

 twice length of tube; capsule elliptic, 5 to 6 lines long. 



