68 MUTATIONS, VARIATIONS, AND RELATIONSHIPS OF THE OENOTHERAS. 



New Jersey. — Pine barrens, Miss Treat of Vineland, i-Sji, "wild." This has a flower 

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

 long and over, Imt the bud is stouter and heavier liian O. grandi flora and has more the char- 

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

 t he pine barrens. 



Maine. — Orono. M. L. Fernald, July 17, 1S92. A specimen with very much the appear- 

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

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

 biennis var. grandiflura and Oenothera grandijhra from California appear to be Oenothera 

 hookeri Torrey & Gray. 



OENOTHERA SBKSIAXA Seringe. 



Oenothera corymbosa S\mi. Curtis's Bot. Mag., 43: pi. 1974. 1818. Not Lamarck. 

 Onagra .tpeclabilis Spach. Xouv. ann. mus. Paris. 4: i52, 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 3,5 mm. long, lo 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 

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

 blades oblong to obovate, 

 broadest somewhat above the 

 middle, taperingtothe 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 ])ubescent all o\er, the 

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

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



Adult plant. — Plant ratlier straggling in appearance, ai)pressed-pub^scent 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 rci)and-denticulate, 

 oblong-lanceolate to lanceolate, acute or acuminate at the apex, abru])tly narrowed into a 

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

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

 cluster of the inflorescence symmetrical, the floral l)racts divaricate and somewhat retlexed; 

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

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



Fig. 72. — 0(>)^c>//^l■»■a.s'^)«.vl(^)^<7 seedling about 6 weeks after germination. 



