lxii GARDEN BOTANY. 



It. PonticuHl, from Armenia, hardy, but here growing low, with smooth 

 lance-obovate leaves green on both sides, and large purple flowers. 



R. arboreum is the commonest greenhouse species, with obovate-lanceo- 

 late leaves, either silvery-white or reddish-brown underneath ; and the ovary 

 of 8 or 10 cells ; flowers large, red, purple, or white. 



Order PLUMBAGINACEJE. Leadwort Family. 



Manual, p. 270. — One hardy and one tender greenhouse plant represent the 

 order in cultivation. 



Stems leafy, branching : flowers in a loose spike ; corolla monopetalous, 



salver-shaped, with a slender tube : style one : stigmas 5. . . 1. PLUMBAGO. 



Caespitose perennials, with narrow and rigid radical leaves, and naked 



scapes, bearing a head of nearly 5-petalous flowers : styles 5 2. ARMERIA. 



1. Plumbago Capensis, Cape Leadwort ; has rather woody and an- 

 gled stems, oblong-spatulate leaves, and handsome pale lilac-blue corollas, 

 the tube l£' long. 



2. Armeria vulgaris, Common Thrift. Familiar in gardens, where it 

 is used for edging ; the densely tufted leaves narrow linear ; scape 3' to 6' 

 high ; flowers rose-color, intermixed with scarious bracts. 



Order PRIMULACE^I. Primrose Family. 



Manual, p. 270. — Several are familiar in gardens or greenhouses, cultivated 

 for ornament. 



Corolla salver-shaped or narrowly funnel-shaped : leaves all radical. 1. PRIMULA. 

 Corolla deeply 5-parted, the divisions reflexed : leaves all radical, 



From a fibrous root : scape many-flowered. . . Man. p. 272. DODECATHEON. 



From a flat corm : scape 1-flowered. 2. CYCLAMEN. 



Corolla deeply 5-parted, rotate : stems leafy. 



Filaments beardless : pod not opening round the middle. . . 3. LYSIMACHIA. 



Filaments bearded : pod opening round the middle. . . 4. ANAGALLIS. 



1. Primula Sinensis, Chinese Primrose. A common house-plant, 

 pubescent ; leaves 7 - 9-lobed and toothed, rounded, with a cordate base ; umbel 

 many-flowered, often proliferous ; calyx conical-inflated, nearly as long as 

 the tube of the large and showy pink or white corolla. Some varieties have 

 double flowers. 



P. veris, Common Primrose. Leaves many in a tuft, wrinkled, pale- 

 green, denticulate, oblong, with the base contracted into a short-winged 

 petiole ; corolla straw-yellow, but varying in cultivation into many colors, the 

 lobes notched at the end. — The Polyanthuses are cultivated varieties. The 

 English Cowslip is the form with the umbel of flowers raised on a peduncle 

 above the leaves, the corolla smaller and its limb concave. The true English 

 Primrose is a variety with a large and flat limb to the corolla, and the com- 

 mon peduncle wanting, so that the umbel is sessile, and the flowers thus appear 

 as if radical among the leaves. The Oxlip is between these two. 



P. Auricula, Auricula. Leaves obovate-spatulate, sessile, thick, ana 

 very smooth, pale, often mealy ; umbel raised on a scape ; corolla funnel- 

 shaped, of many colors, single, double, &c. 



2. Cyclamen Europseum, Common Cyclamen, and occasionally one 

 or two other species, are prized for house-culture; the broad and flat corm sends 

 up thick and smooth round-cordate leaves, often purple underneath, on slender 



