330 RED AND BLACK CURRANTS, ETC. 



R. rubrum, L. Red Currant. Unarmed bush, with 

 glabrous leaves and flowers. 



Flowers small, homogamous, with exposed honey ; 

 hermaphrodite, in pendent racemes; stalks glabrous, 

 bracts ovate, twice as long as the slender pedicels. Calyx 

 cup -shaped, yellowish-green or dashed with brown. Pollen 

 pale lemon-yellow, polymorphic, irregularly globoid, de- 

 formed and creased, and finely punctate, about 24 p, long. 

 Stigma divided, spreading. Berries as large as a pea, 

 red, thin-skinned. 



Lower pedicels longer, tomentose; berry 

 black, odoriferous with glandular hairs. 



R. nigrum, L. Black Currant. Unarmed bush, with 

 pubescent and glandular leaves and flowers. Flowers 

 rather large, homogamous, with exposed honey; in loose 

 racemes more or less pendent, stalks pubescent or to- 

 mentose ; bracts subulate, much shorter than the pedicels. 

 Calyx campanulate, green and red, glandular pubescent. 

 Pollen sulphur-yellow, 4-angled, pyramidal or truncate- 

 conoid, or prismatic: the faces plane or curved, finely 

 punctate, about 20^. Style terete, capitate. Fruit gland- 

 dotted. 



Ovary 2 ^-chambered ; berries black; seeds 

 few. 



l~l Flowers in simple umbels, greenish. Root- 

 climber with glossy evergreen leaves. 



Hedera Helix, L. Ivy (Fig. 136). Evergreen root- 

 climber, with ovate to broadly 5 -angled, highly polished 

 leaves. 



Flowers mostly hermaphrodite in simple hemispheri- 

 cal umbels, which are often grouped into racemes at 

 the ends of the branches. With an unpleasant odour, 



