LIST OF GREENHOUSE PLANTS. 



541 



New Zealand, and thrive in a cool, airy atmosphere and 

 a compost of peat and loam. Cuttings. 



P. ferruginea {decussata). Oblong leaves half an inch long, 

 red flowers in heads an inch across. 



Fig. 660.— Pleroma macranthum. 



P. ligiistrina. Ovate leaves an inch long, flowers white in 

 large heads. 



P. spectabilis. Long narrow leaves, large heads of white 

 flowers tinged with pink. 



Pittosporum. — A large genus of evergreen trees and 

 shrubs, some of which are handsome garden plants. They 

 thrive in peat and loam in pots or borders. 



P. crassifolium. Oblong dark-green leaves, white beneath; 

 flowers dark purple. New Zealand. 

 P. tenuifolium. Neat bush; small green leaves. New Zealand. 

 P. Tobira. Strong bush; large oval leaves. China and Japan. 

 P. undulatum. Large bush; oval leaves, white fragrant flowers. 



Platytheca galioides (Tetratheca verticillata) is a 

 Heath -like shrub from Australia. It grows about 18 

 inches high, has small linear leaves, and blue flowers 

 nearly an inch across. Peat. Cuttings. 



Pleroma (Tibouchina). — Ornamental shrubs with 

 showy flowers. P. macranthum (fig. 660) is a straggling 

 bush suitable for training to the roof of a greenhouse. It 

 has large ovate leaves and purple flowers 4 inches across. 

 Var. floribundum has still larger flowers. Brazil. Peat 

 and loam. 



Plumbago capensis is a scandent shrub useful for 

 draping pillars. It is rarely out of flower. The type is 

 light -blue, and there is a white-flowered variety. Good 

 also as a screen. S. Africa. P. rosea is dwarf, and has 

 rose-coloured flowers. India. 



Polygala. — The greenhouse species are hard-wooded 

 plants bearing showy Pea-shaped blossoms. They are 

 easily grown, thriving in a mixture of peat and loam. 

 P. rayrtifolia, with Myrtle - shaped leaves and purple 

 flowers, var. grandiflora, with larger flowers, and P. 



oppositifolia, with small opposite leaves and purple 

 flowers, are useful. 



Protea. — .South African evergreen shrubs. The flowers 

 are in round heads surrounded by bracts, which are often 

 very showy. Cool, airy house. .Sandy peat. 



P. cordata. A low-growing bush with heart-shaped leaves and 

 purple flowers encircled by red bracts. 



P. cynaroides (fig. 601). A tall-growing bush with large glab- 

 rous leaves and Artichoke-like heads of greenish-white flowers 

 encircled by large rosy bracts. 



P. grandljlora. A sturdy plant with large oblong leaves and 

 white flowers. 



Pueraria Thunbergiana. — A strong, climbing, Japanese 

 Leguminous plant. Its strong annual shoots sometimes 

 attain 30 feet in length. Leaves large, ternate ; flowers 

 large and showy. Loam. 



Pultenaea. — Hard -wooded Australian shrubs with 

 small leaves and yellow Pea-shaped flowers. P. daph- 

 noides, P. densifolia, P. flava, and P. flexilis, all with 

 small yellow flowers, are worth growing. Peat. 



Punica Granatum, the "Pomegranate", is a very 

 ornamental plant, the flowers being conspicuous and 

 scarlet. Two varieties are flore plcno, with orange -scarlet 

 flowers 3 inches across, and nana,, with small flowers but 

 very free. There is also a white variety. Loam. 



Ranunculus cortuscefolius is worth growing for the 

 greenhouse. It is a Canary Island plant with large 

 leaves, and large heads of flowers on stalks 3 feet high. 

 Loam. Seeds. 



Raphiolepis. — Evergreen shrubs with Pyrus-like 

 flowers. P. indica, a Chinese plant, has narrow leaves 



Fig. 661.— Protea cynaroides. 



and panicles of white flowers, and P. ovata, from Japan, 

 has larger leaves and flowers. Loam. 



Reinwardtia. — Related to Linum. Dwarf free-flower- 

 ing pot -plants. P. tctragyna (fig. 662). with oval acu- 



