A FLORA OF GIBRALTAR AND THE NEIGHBOURHOOD 71 



E. Centaurium Pers. Dry rough and bushy places, and 

 woods; occasional or frequent; 5-7. Flowers sessile, medium- 

 sized, always in a flat-topped more or less dense corymb. I. A large- 

 flowered form from east slopes below Middle Hill may be the true 

 var. grandiflora Pers. (non Biv.), and a dwarf form with a rosette 

 of very broad leaves, from the foot of the precipice below, may be 

 the same ! Type not seen. III. i. and ii. ! A white or very pale 

 pink-flowered form replaces the normal about El Cobre ! 



Var. suffruticosa Griseb. has stem subwoody at base, and 

 shorter corolla lobes, but most specimens I have seen so labelled 

 are quite herbaceous at the base. I. Not frequent, K. III. i. In 

 great abundance on road to Cork Woods in company with 

 E. major, K. No Erythrcsa is abundant there now, but type 

 E. Centauriwn is fairly frequent. San Eoque, Boiss. iii. Hills 

 near Los Barrios, P. L. Perhaps outside our limits. 



E. grandiflora Biv. {E. Boissieri Wk., E. sanguinea Mab. ?, 

 E. Centaurium var. grandiflora Pers.?). Similar places and by 

 ditches; frequent in Spain, rather rare on Eock; 5-7. Flowers 

 very large, in a lax cyme, not a compact corymb. I. ! III. ! 



\E. acutiflora Schott. Similar places ; rare; 6. Short, leaves 

 very acute, corolla lobes narrow, acute. The description hardly 

 differentiates it from E. tenuiflora. III. i. By streams of San 

 Koque, Schott. ii. Damp places at Algeciras, Bev. 



[BlGNONIACE^.] 



[Gatalpa sijringcBflora Sims is only cultivated.] 



Con VOL VUL ACE.E . 



Convolvulus althceoides L. Dry fields, &c., abundant ; 4-6. 

 I! II.! III.! 



C. arvensis L. Fields and sandy places; very common; 5-8. 

 I.! III.! 



f Var. linearifolius Choisy, with elongate broadly linear leaves, 

 is alone recorded by Debeaux, but the type is much more fre- 

 quent. I. K. 



f C. siculus L. Dry bushy and stony places ; frequent on the 

 Eock ; 3-5. I. ! III. i. Queen of Spain's Chair ; rare ! 



tC undulatus Cav. Cultivated and sandy fields; rare; 4-6. 

 Annual, leaves broadly oblong, flowers subsessile, axillary. Ill, i. 

 Foot of San Eoque, Wk. 



C. tricolor L. Fields ; common, sometimes abundant ; 4-6. 

 Flowers bright blue, with white tube and yellow throat, sepals 

 hirsute, in a cylindrical tube at base, spreading above, occasionally 

 spathulate. A very pale-flowered form occurs, quite distinct from 

 next. I. Eare, near Naval Hospital, K. II. ! III. ! 



C. meonantJnis Hoffm. & Link. Similar places, also on rough 

 hills ; common, often a field full ; 4-5. Flowers smaller, pale 

 lilac, not blue, sepals subglabrous, in a conical tube from base, 

 not spreading above. The two species seldom grow together. 

 III. i. Much commoner than last ! ii. and iii. ! 



