RYDBERG PENTSTEMON 



Pentste'mon rydber'gii, syn. P. aggrega'tus 



W144 

 (2 leaves) 



Flowers pale blue to purple, crowded, 

 in an interrupted end cluster (thyrsus) 

 United petals (corolla) narrowly bell- 

 shaped, about % to % in. long, about % 

 in. wide at the throat, 2-lipped; upper 

 lip 2-lobed; lower lip 3-lobed, the lobes 

 spreading and hairy at the throat 



Stamens 5, 4 of them with pollen 

 sacs (anthers); 5th stamen without 

 anther but prominent, narrowly club- 

 shaped, short-hairy 



Outer flower parts (sepals) 5, small, 

 less than % as long as corolla, long- 

 pointed, with whitish or purplish, pap- 

 ery, often toothed margins 



Stems erect, up to 24 in. high, usually 

 somewhat spreading at base 



Leaves opposite, entire; stem leaves 

 stalldess, lance-shaped; basal leaves 

 stalked, reverse-lance-shaped, often 

 tufted 



Roots locks 

 ennial 



-horizontal, branched, per- 



Roots fibrous 



