ONAtJUA*;!-:.!!:. iKnoth, 



7. CENOTHERA, Linn. 



C/ulyx-tubo nioio or loss itii)li»ii}^cil ubovo llm ovary (obcoiiio to liiioar), dociduous 



(except ill § 2) ; segnieiits relluxod. Petals 4, obconlate to obovato, sessile, yellow 



to wliite, often tinged with red or turning red in fading. Stamens 8, eijual or those 



opposite to the ])etals shorter; anthers perfect, versatile. Ovary 4-celled, iiiany- 



ovuled : style filiform : stigma 4 lobed or capitate. Capsule coriaceous or somewhat 



woody to membranaceous, dehiscing loculicidally and more or less perfectly 4-valved ; 



the partitions more or less coberent to the valves. Seeds in 1 or 2 rows in each cell, 



horizontal or ascending, often somewhat margined. — Herbs, or sometimes Avoody at 



base; leaves alternate; lloweis axillary, si)i(:ate, or racemose. — Watson, l^roe. Am. 



Acad. viii. 573. 



A genus of jierhaps 100 .s|)i.-uies, aluiost excUisively American, there being over 50 in tlie United 

 States and most of the remainder Mexican or South Ameriean. Many of them are ornamental 

 and several liave long been in cultivation. Our sixi ius are usually found freiiuenting dry valleys 

 and hillsides. 



♦ Calyx-tube linear above the ovary : antliers and stignia-lobes linear : capsule rigid-coriaceous. 



Tall : flowers yellow, erect in the bud ; calyx-tips free : seeds in two 



rows in each cell. 1. (K. UlKNMs, 



Low : lloweis iaige, whitish, nodding in the hud : capsule narrow : 

 seeds in 1 row. 

 Perennial : calyx-lii)s free : capsule linear : seeds not compressed. 

 Smooth or jjuberulent : calyx not villous : seed terete, narrowly 



oblong. 2. (E. ALBiCAULls. 



Villous and pubescent: seeds oblong, turgid, somewhat angled. 3. Qi. C'ALlFoitNiOA. 

 Annual, villous and pubescent : calyx-tips not free : capsule thicker 



toward the base : seeds ovate-oblong, compressed. 4. CE. tkichocalyx. 



Acaulescent or nearly so : flowers large, erect in hud : capsule ovate- 

 oblong, winged or crested : seeds in 2 rows. 

 Capsule strongly ribbed or tuberculately crested : more or less 



jMibe.scent. .5. (E. CACSI'ITOSA. 



Capsule winged at the angles : nearly glabrous. (5. (E. tuiloua. 



♦ * Calyx-tube liliform : anthers oblong : stigma capitate : cajisule ovoid-oblong, membranaceous, 



sessile : seeils in 2 rows. Acaulescent, mostly perennial : flowers yellow, ere<;t in bud, tips 

 of calyx not free. 



Densely pubescent : leaves deeply pinnatitid. 7. (E. Nuttallii. 



Glabrous : leaves oblanceolate, nearly entire. 8. <E. iiETliitANTllA. 

 Somewhat pubescent: leaves ovate- to oblong-lanceolate, entire, cili- 



ate: .seeds jjunctate. i». (K. ovata. 



Annual, dwarf, hirsute : leaves linear : capsules winged above. ID. (E. i;uA(ai.ii''i.(HtA. 



♦ ♦ ♦ Calyx-tubo obconic : anthers oblong : stigma capitate : capsule narrow, membranaceous, 



sessile : seeds in 1 row : caulescent, mostly annual. 



Flowers axillaiy, yellow, mostly showy, often turning green : capsule 

 usually contoit<'d, sliar|)ly 4-angled. 

 Canesceutly ])ubescent : leaves thick, mostly entire : maritime, 



often woody at base. 11. (E. CIIEIUANTIIIFOI.IA. 



More or less hirsute : leavt^s thinner, denticulate. 



Petals 4 to 7 lines long, usually with a brown spot at base. 12. (E. ukstouta. 



Petals a line or two long, not siiolletl. 13. Ui. micuantua. 



Flowers axillary, yelhiw, mostly very snuill and usually turning red. 

 Capsule elongated, very narrowly linear, obtusely angled : slender, 

 with narrow leaves. 

 More or less hirsute : petals rarely reddening : capsules shortly 



beaked. 14. (E. dentata. 



Somewhat apiiressed-jtuberulent or hirsute : petals usually red- 

 dening : capsules obtuse, often pedicellate. 15. (E. STKi(;uLOSA. 

 Capsule short, attenuated upward from the base : dwarf. 16. (E. ANDINA. 

 Flowers in a nodding spike, white or rose-colored : capsule narrowly 

 linear, terete, much contorted. 



