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nected by aberrant species. Typical species have the following 
character 
Dente Flower-buds erect. Flowers nocturnal. Petals 
yellow. Ovules horizontal, 2-4-seriate. Seeds prismatic. 
Raimannia. Flower-buds erect. Flowers nocturnal. Petals 
yellow. Ovules ascending, biseriate. Seeds subterete. 
Anogra. Flower-buds drooping. Flowers diurnal. Petals 
white, ee pink. Ovules ascending, uniseriate. Seeds 
subterete 
It will be seen that Raimannia has certain characters of 
Oenothera and others of Anogra. Oenothera has horizontal ovules 
and strongly angled seeds, whereas Raimannia and -Anogra have 
ascending ovules and subterete seeds. On the other hand 
Oenothera and Raimannia have erect flower-buds and yellow 
flowers, while Anogra has drooping flower-buds and white or 
pink flowers. 
Oenothera (Onagra) was stated by Raimann to be confined to 
America, but it is represented in the Andes of Bolivia 
and Peru by at least four species, Oe. coccinea, Britton,* Oe. 
Susca, Sprague et Riley, comb. nov. (Onagra fusca, K. Krause), 
Oe. serratifolia, K. Krause, and Oe. scabra, K. Krause.t Britton 
stated that Oe. coccinea is related to Oc. mollissima (Raimannia 
mollissima), but the horizontal quadriseriate ovules, and the 
cylindric-ovoid capsule with compressed seeds clearly indicate it 
to be a true Oenothera (Onagra). He described the flowers as 
** coccinei,”’ but it is uncertain whether this was from field-notes 
or from dried specimens. It should be remembered that the 
yellow colouring of the petals in these genera frequently changes 
to pink on g. 
Krause placed Oe. serratifolia and Oe. scabra in Oecnothera, 
Spach (Raimannia). That they should be referred to Ocenothera, 
Linn. (Onagra) is evident from the horizontal quadriseriate 
ovules, and the shape of the young capsules. 
Among the aberrant species Raimannia mexicana appears to 
have ems buds, judging from herbarium specimens, agreeing 
in this respect with Anogra, but it has the yellow flowers and 
biseriate oviee of Raimannia. On the other hand Anogra 
coronopifolia has the biseriate ovules characteristic of Raimannia, 
to which genus Rose referred it; but its nodding buds, purplish 
flowers and general habit point to a closer relationship with 
Anogra, in which it should be retained. It is evidently allied 
to A. albicaulis, Britton. 
No great importance can be attached to the diurnal or 
nocturnal expansion of the flowers as a generic character. The 
flowers of Raimannia are generally described as nocturnal and 
those of Anogra as diurnal. But a Raimannia collec in 
Patagonia by Mr. J. L. Williams Andrews has diurnal flowers : 
* Bull. Torr. Bot. Club, 1890, xvii. p. 213. 
{+ Fedde, pert. i. pp. 167-8 (1905), 
