68 MUTATIONS, VARIATIONS, AND RELATIONSHIPS OF THE OENOTHERAS. 



New Jersey. Pine barrens, Miss Treat of Vineland, 1871, "wild." This has a flower 

 that when expanded must have measured nearly 10 cm. in diameter, the petals being 5 cm. 

 long and over, but the bud is stouter and heavier than O. grandiflora and has' more the char- 

 acter of that of O. lamarckiana. It might be interesting to know whether it still survives in 

 the pine barrens. 



Maine. Orono. M. L. Fernald, July 17, 1892. A specimen with very much the appear- 

 ance of Oenothera rubrinerms, having the very characteristic bud of that derivative of O. 

 lamarckiana. It is probably not indigenous. Large-flowered specimens labeled Oenothera 

 biennis var. grandiflora and Oenothera grandiflora from California appear to be Oenothera 

 hookeri Torrey & Gray. 



OENOTHERA SIMSIANA SERINGE. 



Oenothera corymbosa Sims. Curtis's Bot. Mag., 45: pi. 1974, 1818. Not Lamarck. 

 Onagra spectabilis Spach. Nouv. ann. mus. Paris, 4: 352, 1835. (Repr. 32, 1836.) 

 Oenothera simsiana Seringe, in DC. Prodr., 3: 47, 1828. 



Seedling about 6 -weeks old. Leaves glabrate ; blades oblong, those of the later leaves oval, 

 20 to 35 mm. long, 10 to 15 mm. wide, obtuse at the apex, gradually tapering into the 

 margined petiole, light yellow-green (fig. 72). 



Seedling about 5 months 

 old. Rosettes rather loose, 

 40 to 45 cm. in diameter, 

 spreading; outer leaves 15 to 

 20 cm. long, 4 to 6 cm. wide; 

 blades oblong to obovate, 

 broadest somewhat above the 

 middle, tapering to the obtuse 

 apex or in the younger leaves 

 to an acutish apex, gradu- 

 ally tapering into the broad 

 petiole, light yellow-green, 

 obscurely puberulent, with 

 widely scattered hairs on 

 both surfaces (under a lens), 

 approximately repand- 

 denticulate with rather dis- 

 tinct shallow teeth; petiole 

 white, 8 mm. or more wide. 



Mature rosette. Leaves loosely spreading, finely but obscurely pubescent all o\er, the 

 larger ones 20 to 28 cm. long, 5 to 6 cm. or more wide; blades oblong to oblong-obovate, 

 shallowly repand-denticulate, tapering into a very wide white-margined petiole (plate 13). 



Adult plant. Plant rather straggling in appearance, appressed-pubescent and hispidu- 

 lous, especially in the upper portions. Main stem about 2 m. in height, greenish-white, 

 becoming reddish, stout, terete, or slightly angled and sulcate above, irregularly branched 

 at the base, the long, rather weak, virgate branches ascending; leaves minutely pubescent 

 above, somewhat less so beneath, 7 to 10 cm. long, blades obscurely repand-denticulate, 

 oblong-lanceolate to lanceolate, acute or acuminate at the apex, abruptly narrowed into a 

 very short margined petiole or the uppermost sessile, coriaceous, very brittle, bright yellow- 

 green, soon turning red, twisted, the upper ones more markedly so; terminal rosette-like 

 cluster of the inflorescence symmetrical, the floral bracts divaricate and somewhat reflexed ; 

 bracts lanceolate, acuminate, subsessile and subcordate; conic portions of the bud 2 cm. 

 long, 6 to 7 mm. in diameter at the base, canescently appressed-pubescent and hirsute, 



FIG. 72. Oenotliera simsiana. seedling about 6 weeks after germination. 



