PHANEROGAMIA 



657 



Flowers solitary, long-stalked, situated in the axils of the leaves and sometimes in 

 the axils of the bracteoles of another flower. Calystegia has two large bracteoles 

 placed immediately beneath the calyx. C. sepium. The Dodder (Cuscuta) ( 47 ) is a 

 slender parasitic plant containing very little chlorophyll, which attaches itself by 

 means of haustoria to a number of different host plants. The small flowers are 

 borne in dense clusters (cf. p. 229, Fig. 202). Ipomoea is for the most part a 

 tropical genus ; several species are cultivated as ornamental plants. /. jjescaprae 

 is one of the strand plants of tropical countries. 



OFFICIAL. JALAPA is obtained from Exogonium purga (Fig. 730), a twining 



FKI. 732. Kchluin vulgare. Inflorescence (J nat. size), 

 flower and fruit, composed of four nutlets (enlarged). 



B 



/ \ 



Kid. 731. Borago officinalis. a, 

 Flower ; b and c, fruit (nat. size). 



FIG. 733. Floral diagrams of Verbena officinalis (A), (after 

 BICHLER), and of Lamiiim (Labiatae) B. 



plant, with tuberous lateral roots, occurring on the wooded, eastern slopes of the 

 Mexican table-land. SCAMMONIAE RADIX is the dried root of Convolvulus Scumiinmin 

 (Asia Minor). 



Family 2. Polemoniaceae. Carpels usually three. No milky juice. Polemonium 

 coeruleum occurs in Britain. Cobaea seandens and Phlox are cultivated. 



Family 3. Hydrophyllaceae. K 5, C (5), A 5, G (2). Inflorescence a 

 cincinnus. 



Family 4. Boraginaceae. Herbs with alternate leaves. These and the stems 

 are covered with coarse hairs (Asperifoliaceae). Inflorescence always cincinnal ( 48 ). 

 Flowers actiuomorphic or zygomorphic. Petals frequently provided with scales 



2 IT 



