SELECTION OF PLANTS. 173 



537. PENTSTEMON SPECIOLUM. Showy Pentstemon. 



Class 14. Didynamia Angiospei-mia. 



A beautiful Perennial species, and a native of North- 

 west America. It flowers from June to September. 



We must not depend so much upon propagation by the 

 roots as from the seeds, which are produced in abundance. 

 It is quite hardy, and grows in common garden soil. 



538. THERMOPSIS FABACEA. Bean-leaved Thermopsis. 



Class 10th. Decandria Monogynia. 



It is a good herbaceous plant, remarkable for the neat- 

 ness of its foliage and flowers. It rises from 2 to 3 feet 

 high, and easily increased by division of its creeping roots. 



It is a native of Asia, and also of America. 



539. PENTSTEMON SCOULERI. Dr. Scoulers Pentstemon. 



Class 14th. Didynamia Angiospermia. 



A very hardy Perennial, growing in any soil, and in- 

 creased abundantly either by seeds or cuttings. It blos- 

 soms in May and June, and is one of the handsomest 

 border-flowers of that season. 



It is a native of the Kettle Falls of the Columbia. 



540. PENTSTEMON PRUINOSUM. Blue-leaved Pentstemon. 



Class 14th. Didynamia Angiospermia. 



It is perfectly hardy and Perennial, but like many other 

 plants is apt to exhaust itself so much in flowering, that it 

 is necessary to pinch off part of the buds, upon their first 

 appearance, a practice which may be advantageously 

 adopted with regard to all plants having similar habits. 



