74 TREES AND SHRUBS 



I. RIBES L. Currants 

 Inarmed or bristly shrabs with palmately veined, mostly lobed 

 leaves; flowe eral-flowered racemes; pedicels jointed; ovary 



not spiny, sometimes glandular; hypanthium tubular to cup-shaped, 

 sometimes obsolete; fruit breaking from the pedicel. 



Stems armed with spines. (Leaves pubescent 



or glandular hairy; berries bright red.) i. je. montigenum. 



Stems unarmed. 



Sepals slightly united at the base, the hypan- 



tnium obsolete. 2. R. coloradense. 



Hypanthium evident (very short in R. wolfii). 

 Anthers with a conspicuous cup-shaped 

 gland. 



Hypanthium 3 or 4 times as long as 



broad; fruit red. 3. R . inebrians. 



Hypanthium less than twice as long as 



broad; fruit black. j. Ri mescalerium. 



Anthers with at most a callus at the apex. 

 Hypanthium smooth, 3 or more times as 

 long as thick; leaves involute in ver- 

 nation- 5. R. aureum. 

 Hypanthium hairy, shorter; leaves pli- 

 cate in vernation. 

 Leaves with amber-colored glands on 

 both surfaces; hypanthium and ca- 

 lyx together >/ 2 inch long. 6 . R. americanum 

 Leaves without glands; hypanthium 

 and calyx together a mm. long or 

 less - '■ R. wolfii. 



GROSSULARIA Mill. Gooseberry 

 Spreading shrubs with numerous stems armed at the nodes 

 with simple or 3-forked spines; leaves broadly ovate to rotund, 

 rather deeply 3- to 5-lobed, the lobes coarsely crenate; racemes 

 few-flowered; pedicels not jointed; ovary and fruit spiny, hairy or 

 smooth; hypanthium evident; fruit not separating from the pedicel. 



Ovary densely bristly, the bristles developing 



into sharp, stout spines in fruit. i. G . pinetorum. 



Ovary smooth with weak, gland -tipped bristles 



not spiny in fruit. 



Style glabrous; leaves small, 2 mm. in diam- 

 ter or less, on petioles as long or shorter, 

 -■rowded; young stems densely spiny, the 

 spines usually stout, often 1 cm. long, di- 

 vergent and curvejj; flowers copiously 

 ciliate and somewhat glandular outside. 2. G. leptantha. 



Style hairy near the base; leaves larger, 

 mostly more than % j ncn j n diameter, on 

 rather slender petioles longer than the 

 blade, not so numerous as in the preced- 

 ing; young stems mostly smooth, the 

 spines short, often deflexed, 14 inch long 

 or less; flowers almost glabrous outside. 3 g inermia 



