846 



LABIATyE. XCI. LEUCAS. 



mouth equal or drawn out obliquely above or beneath, 8-10- 

 toothed. Corolla with an inclosed tube, which is annulate, or naked 

 inside, and a bilabiate limb ; upper lip concave, erect, entire, 

 rarely emarginate, very hairy outside ; lower lip longer, spread- 

 ing, trifid, the middle segment the largest. Stamens 4, didyna- 

 mous, ascending, the lower ones the longest ; filaments naked at 

 the base ; anthers approximate by pairs under the upper lip, 

 sub-bilocular : cells divaricate, confluent. Upper lobe of style 

 very short, lower one subulate and stigmatiferous towards the 

 apex. Achenia dry, triquetrous, obtuse at apex. Herbs or 

 under shrubs. Leaves quite entire or usually toothed ; floral 

 ones nearly similar. Whorls sometimes few-flowered and some- 

 times densely many-flowered. Corollas usually white, rarely pur- 

 plish. Scarcely differing from Ballbla, except in the unequally 

 lobed stigma, but the calyx, corolla, and the general habit mark 

 it out as a good genus. 



SECT. I. HEMI'STOMA (from fyu, hemi, half, and oro/^a, stoma, 

 a mouth ; the lower side of the calyx is alone drawn out.) Benth. 

 lab. p. 605. Hemistoma, Ehrenb. Calyx tubular, with an ob- 

 lique mouth ; lower side drawn out, cleft above. Whorls glo- 

 bose, many-flowered. Bracteas numerous, equalling the calyxes. 



1 L. I'NDICA (R. Br. prod. p. 504.) herbaceous ; stems and 

 under sides of leaves clothed with silky tomentum ; whorls 

 many-flowered, globose ; calyx rather villous, membranaceous, 

 having the 3 lower teeth short and setaceous, the upper ones 

 having disappeared. Q. S. Native of Madagascar. Phldmis 

 I'ndica, Lin. spec. 820. Leaves broad-ovate, acutish, coarsely 

 and serrately crenated. Corollas exceeding the calyx a little, 

 densely clothed with white hairs or villi. 



Indian Leucas. Fl. July, Aug. Clt. 1789. PI. 1 foot. 



2 L. URTKXEFOLIA (R. Br. prod. p. 504.) herbaceous, clothed 

 with fine canescent tomentum ; whorls many-flowered, globose ; 

 calyx rather villous, membranaceous, with 8-10 very short seta- 

 ceous teeth. 0. S. Native of the East Indies, Abyssinia, and 

 Arabia. Phlomis urticaefolia, Vahl, symb. 3. p. 76. Leucas 

 afflnis, R. Br. in append, to Salt, abyss. Hemistoma ovata, 

 Ehrenb. mss. Habit and inflorescence of L. I'ndica. Stems 

 decumbent or ascending at the base. Leaves broad, ovate, 

 coarsely and serrately crenated. Corollas white. 



Nettle-leaved Leucas. Fl. July, Sept. Clt. 1810. PI. 1 to 

 1 foot. 



SECT. II. LOXO'STOMA (from Xooe, loxos, oblique ; and <rro/m, 

 stoma, a mouth ; mouth of calyx oblique.) Benth. lab. p. 606. 

 Calyx tubular, with an oblique mouth, the lower side more 

 drawn out than the upper, and hardly cleft above. Whorls few- 

 flowered. Bracteas minute. 



3 L. GLABRA'TA (R. Br. prod. p. 504.) herbaceous, glabrous ; 

 whorls 2-4- flowered, secund ; calyx glabrous, with 10 subulate 

 teeth. 0. S. Native of Delagoa Bay, and Arabia Felix. 

 Phlomis glabrata, Vahl, symb. 1. p. 42. Plant often purplish. 

 Stems elongated, decumbent. Leaves ovate or oblong, few- 

 toothed. Corolla purplish. 



Glabrous Leucas. PI. decumbent. 



SECT. III. PHYSOCA'LYX (from fyvtra, physa, a bladder ; and 

 k-a\v, calyx, a calyx; calyx inflated.) Benth. lab. p. 744. 

 Calyx inflated, with a contracted equal mouth. Whorls 6-10- 

 flowered. Bracteas minute. 



4 L. INFLA'TA (Benth. lab. p. 744.) shrubby ; leaves sessile, 

 orbicular, subcordate at the base, hairy on both surfaces, and 

 green; whorls subspicate ; calyx with 10 short erect teeth: 



throat nearly naked inside, 

 desert of Suez, N. Bove. 

 I)iflated-ca.\yaed Leucas. 



J? . G. Native of Arabia, in the 

 Shrub. 



SECT. IV. ORTHOLEU'CAS (from opOog, orthos, straight ; and 

 Leucos ; in reference to the equal mouth of the calyx.) Benth. 

 lab. p. 606. Ortholeucas, Benth. in Wall. pi. rar. asiat. 1. p. 

 61. Whorls rather loose, usually few-flowered. Bracteas mi- 

 nute or few, setaceous, rarely almost equalling the calyxes. 

 Calyx tubular or sub-campanulate, striated, with an equal or 

 scarcely oblique mouth, a nearly naked throat, and 10 erect, 

 subulate, or very short setaceous teeth. 



5 L. CHINE'NSIS (R. Br. prod. p. 504.) suffruticose ? ; 

 branches clothed with silky tomentum ; leaves broad-ovate, 

 coarsely toothed, wrinkled, villous, white beneath ; whorls few- 

 flowered ; calyx funnel-shaped, tomentose, with an equal 

 acutely 10-toothed limb, f? . G. Native of China and the 

 Indian peninsula. Phlomis Chinnsis, Retz, obs. 2. p. 19. 

 Habit of L. montana and L. laniita. Whorls 6-10-flowered. 

 Corollas white. 



China Leucas. Fl. June, Oct. Clt. 1820. Shrub procum- 

 bent. 



6 L. MONTA'NA (Spreng. syst. 2. p. 742.) perennial or suffru- 

 ticose ; branches clothed with silky tomentum ; leaves ovate, 

 serrately crenated, wrinkled, green above and pubescently 

 hairy, but clothed with white wool beneath ; whorls many-flow- 

 ered ; calyx clothed with silky villi, with an equal mouth, and 

 very short setaceous erect teeth. ^ . ? S. Native of India, 

 near Madras. Phlomis montana, Roth, nov. spec. p. 263. 

 Branches ascending, rising from a woody base. Leaves roundly 

 truncate, or broadly cordate at the base. Whorls 15-20-flow- 

 ered. Corollas white ; tube annulate inside. 



Mountain Leucas. Shrub ascending. 



7 L. OVA'TA (Benth. in Wall. pi. rar. asiat. 1. p. 61. lab. p., 

 607.) perennial or suffruticose; branches clothed with silky to- 

 mentum ; leaves ovate, obscurely crenated, wrinkled, green and 

 pubescently hairy above, but clothed with white wool beneath ; 

 whorls many-flowered ; calyx pubescent, with an equal mouth, 

 and very short setaceous straight teeth, fy . ? S. Native of 

 Ava, on the banks of the Irawad,di. Allied to L. montana ; but 

 the leaves are larger and blunter, scarcely broadly crenated, or 

 almost quite entire. 



Ovate-leaved Leucas. Shrub 2 feet. 



8 L. LANA'TA (Benth. 1. c.) perennial or suffruticose; branches 

 clothed with white wool ; leaves ovate, sub-crenated, thick, 

 wrinkled, clothed with very soft white wool on both surfaces ; 

 whorls many-flowered ; calyx clothed with white wool, with an 

 equal truncate mouth, and very short setaceous erect teeth. Jj .? 

 G. Native of the East Indies, in the valleys of the provinces 

 of Kamaon, Sirmore, and Deyra Dhoon, Wall, and Royle. Mar- 

 rubium mollissimum, D. Don, prod. fl. nep. p. 112. Allied to 

 L. montana ; but the plant is clothed with white wool ; the 

 leaves narrower, and less deeply crenated. Corollas white. 



Woolly Leucas. PI. 1 to 1-| foot. 



9 L. MOLLI'SSIMA (Wall. pi. rar. asiat. 1. p. 62.) perennial or 

 suffruticose ; branches tetragonal, clothed with adpressed tomen- 

 tose villi ; leaves ovate, crenated, wrinkled, clothed with soft 

 villi, pale or canescent beneath ; whorls many-flowered ; calyx 

 pubescent, with an equal mouth, and very short setaceous erect 

 teeth. 1} . ? S. Native of^ the East Indies, in the valleys of 

 Nipaul, and on the Pundua mountains ; also of China, Sir G. 

 Staunton. Habit of L. montana, but usually taller, and more 

 branched. Leaves -| to 1 inch, roundly truncate or broadly cor- 

 date at the base. Whorls 10-30-flowered. Corollas white ? 

 or usually purplish ; tube annulate inside. 



