Citrus EUTACEJ: 185 



Petiole with or without a linear margin. 



Petiole not or scarcely jointed with leaflet. Fruit 



large, with thick firm rind 1. C.medica. 



Petiole evidently jointed with leaflet. Fruit smaller, 



with thin rind. 



Fruit oblong, apex usually nipple-shaped, rind close 2. C. Limonuin. 

 Fruit globular-depressed, rind loose G. C.nobilis. 



Petiole with a narrow sublanceolate wing. 

 Leaflet tapering to apex. 



Fruit oblong, apex usually nipple-shaped ; pulp 



acid, yellow 2. C. Limomnn. 



Fruit subglobular, small ; pulp acid, greenish 3. C. auranti folia. 



Fruit subglobular ; pulp sweet and acid combined, 



yellow or sometimes red 4. C. Aurantium. 



Leaflet rounded at apex. Fruit subglobular or pear- 

 shaped ; pulp sweet, acid, and bitter combined... 8. C. paradisi. 



Petiole broadly winged. 



Leaflet and petiole usually puberulous. Fruit large, 



with thick, spongy rind 7. C. grandis. 



Leaflet and petiole glabrous. Fruit smaller, with 



thinner firm rind 5. C.vulgaris. 



1. C. medica L. Sp. PL 782 (1753) (excl. var.) leaflet 

 broadly oblong or oblong-elliptical, 10-20 cm. 1., apex usually 

 rounded, margin serrulate-crenate ; petiole very short, with or 

 without a linear margin, more or less continuous with midrib ; 

 fruit very large, to 20 cm. L, pale or dark bright yellow; outer 

 rind thin, yellow-coloured, aromatic, inner very thick, white <>r 

 cream-coloured, slightly bitter, of a dense firm consistency ; pulp 

 scanty, subacid and somewhat bitter, pale. Hisso In Nouv. 

 Dultci'iiicl vii. 67 t. 22 & Orany. t. 96-100 ; Lunan Hort. Jam. i. 

 196; .I/////, in Hool: Bot. 3Lisc. i. 295 & Jaw. i. 125; Loire Fl. 

 Madeira 71; Grisel. FL Br. W. Lid. 132 (excl. vars. ft, 7) ; 

 Hook. f. FL Br. Lid. i. 514 (excl. vars. 2-4); Benll. l- Trim. 

 Ifrd. PI. t. 53 ; Hmnn Citrus t. 10; P. Wih. in N. Amer. /'/. xxv. 

 222; Si'-ui'/Ir in PL ]]'/7.s. Pt. 4, 141. C. tuberosa MlUcr Gard. 

 Diet. cd. 8 (1768). C. arbor et mains etc. Sloane Cat. 2ns lV : 

 Hist. ii. 176. C. fructu oblongo majori cortice crasso itc. Br<>, 

 Hist. Jan,. :I09. 



Citron. 



Cultivated ; Sloane Herb. vii. 112 ! native of China, and possibly 8 

 of India. 



Slirub or tree, S-10 ft. high ; trunk short, indistinct ; branches amu-d 

 with stout horizontal spines (often long), or sometimes unarmed. Flov 

 solitary or usually in short racemes of 3-10 flowers the buds purplish. 

 Calyx 3-4 mm. 1., shallow, with 5 teeth. Petals 5, oblong, incurved at the 

 tip, white within, usually tinged with purplish-pink outside, nearly -2 cm. 1. 

 Stamens about 40, irregular in length, nearly as long as the petals, usually 

 united below into bundles of about 4 in each. Ovary 9-12-celled. Fruit 

 more or less oblong in outline, often 2 dm. 1., apex usually blunt (rarely 

 nipple-shaped), style often persistent; surface rugged with both transver- 

 and longitudinal furrows, or smooth and even ; rind 3-7 cm. thick, a thin 



