762 



LABIATE. XXXVI. BYSTROPOGON. XXXVII. PYCHNANTHEMUM. 



subulate, shorter than the tube. Jj . G. Native of the Canary 

 Islands. Mentha Canariensis, Lin. spec. 807. Heliotropium 

 Canariense, &c., Comm. hort. amst. 2. p. 129. t. 65. Flori- 

 ferous branches very hispid. Corollas white. Very like the 

 preceding, but differs in the hairiness, and the more slender 

 calycine teeth. 



Canary-Island Bystropogon. Fl. June, Aug. Clt. 1714. 

 Shrub 3 to 4 feet. 



3 B. PLUMOSUS (L'Her. sert. angl. p. 20. t. 22.) leaves ser- 

 rately crenated, clothed with fine tomentum above, and white 

 tomentum beneath ; cymes axillary, dense ; calycine teeth subu- 

 late. [2 . G. Native of the Canary Islands. Habit of B. Ca- 

 nariensis. Leaves of B. origanifblius. Floral leaves shorter 

 than the cymes. Corollas pale purple. ? 



Plumose Bystropogon. Fl. June, July. Clt. 1779. Shrub 

 2 to 3 feet. 



4 B. ERIA'NTHOS (Benth. lab. p. 727.) leaves serrated, green 

 above, and glabrous, and hardly tomentose beneath ; cymes pe- 

 dunculate, corymbose ; calycine teeth ovate ; corolla more than 

 twice as long as the calyx, villous outside. ^ G. Native of 

 the Island of Juan Fernandez, Graham. A humble shrub, with 

 the habit of B. punctdtus ; but the leaves are acute and ser- 

 rated, and the flowers distinct. Tube of corolla inflated beyond 

 the calyx. 



Woolly-flowered Bystropogon. Shrub dwarf. 



5 B. ORIGANIFOLIUS (L'Her. sert. angl. p. 20.) leaves almost 

 quite entire, clothed with white tomentum beneath ; cymes pe- 

 dunculate, paniculately racemose ; calycine teeth subulate. b . 

 G. Native of the Canary Islands. Mentha plumosa, Lin. 

 mant. p. 273. Floriferous branches rather tomentose. Supe- 

 rior floral leaves much shorter than the flowers. Flowers of B. 

 Canariensis, but the calyxes and pedicels are less hispid. 



Marjoram-leaved Bystropogon. Fl. July, Aug. Clt. 1815. 

 Shrub 2 to 3 feet. 



SECT. II. MINTHOSTACHYS (from pivOa, minlha, mint; and 

 ara-^vt, stachys, a spike ; the whorls of flowers are spicate, like 

 those of some species of mint.) Benth. lab. p. 325. Calyx 

 13-nerved, tubular. Whorls densely spicate. This section is 

 intermediate between Bystropogon and Pychnanthemum. 



6 B. SPICA'TUS (Benth. lab. p. 326.) leaves subserrated, green 

 on both surfaces, glabrous ; whorls dense, spicate ; calycine 

 teeth ovate. fj . G. Native of Peru, at Parrochuca, Mathews. 

 Shrub quite glabrous. Leaves 1 to 1^ inch long ; floral leaves 

 much smaller, clothed with hoary tomentum on both surfaces. 

 Whorls 6-10-flowered. Calyx very villous. Corolla hardly 

 longer than the calycine teeth. A fifth fertile stamen sometimes 

 occurs in this species. 



/S/jf'cate-flowered Bystropogon. Shrub. 



7 B. TOMENTOSUS (Benth. lab. p. 326.) leaves a little cre- 

 nated, green above, and rather hispid, at length glabrous, but 

 clothed with tomentose wool beneath ; whorls dense, subspicate ; 

 calycine teeth subulate, fj . G. Native of Peru, Ruiz, et Pav. 

 Young branches villous. Cauline leaves 1-2 inches long, round- 

 ed at the base, obtuse and acute, white or rufescent beneath ; 

 floral leaves gradually smaller : upper ones hardly exceeding the 

 calyxes, and clothed with soft villi on both surfaces. Corollas 

 like those of B. spicata. 



Tomentose Bystropogon. Shrub. 



8 B. CA'NUS (Benth. lab. p. 326.) leaves ovate-lanceolate, a 

 little toothed, canescent beneath ; lower whorls distinct : upper 

 ones subspicate ; calycine teeth subulate. \i . G. Native of 

 Peru, Ruiz, et Pav. Branches villous, slender. Leaves an 

 inch long, acute, cuneately rounded at the base. Flowers 

 smaller than in the preceding. 



Hoary Bystropogon. Shrub. 



f A doubtful species. 



9 B. DENTA'TUS (Poir. suppl. 1. p. 755.) leaves ovate, hairy, 

 serrated ; whorls of flowers hispid. ^ . ? G. Native of Peru. 

 Probably a species of Hyptis. 



Tooled-leaved Bystropogon. Shrub. ? 



Cult. The species of Bystropogon are shrubs of no beauty ; 

 their culture is that of other common greenhouse plants, and 

 they are readily increased by cuttings. 



XXXVII. PYCHNA'NTHEMUM (from KV-^OC, pychnos, 

 dense ; and avOe^ie, anthemis, a flower ; the flowers are dis- 

 posed in dense whorls.) Michx. fl. bor. amer. 2. p. 7. Benth. 

 lab. p. 326. Brachystemum, Michx. fl. bor. amer. 2. p. 5. 

 Koellia, Mcench. meth. 407. Tullia, Leavenworth, in Sill, 

 journ. sc. vol. 20. p. 343. 



LIN. SYST. Didynamia, Gymnospermia. Calyx ovate or tubu- 

 lar, somewhat 13-nerved ; teeth nearly equal, straight, or the 3 

 upper ones are joined at the base into an upper lip ; throat 

 naked inside. Corolla with the tube equalling the calyx, and 

 the limb sub-bilabiate ; the upper lip straight, flat, entire, or 

 shortly emarginate ; the lower lip flat, trifid: lobes all ovate, 

 obtuse. Stamens 4, nearly equal, or the lower ones are rather 

 the longest, straight, diverging, exserted, or inclosed ; anthers 

 2-celled : cells parallel. Style almost equally bifid at top : 

 lobes subulate, stigmatiferous at top. Achenia dry, smooth, or 

 minutely dotted. Perennial, stiff, usually canescent herbs, pani- 

 culately corymbose at top. Whorls few, dense, many-flowered, 

 propped by bracteas, usually forming a terminal head, sometimes 

 one or more disposed along the stem beneath. Corollas white 

 or purplish ; the lower lip usually dotted with purple. 



SECT. I. TU'LLIA (meaning unknown to us.) Benth. lab. p. 

 327. Calyx ovate-tubular, somewhat bilabiate, with usually 

 subulately awned teeth. Whorls few, ample, often loose ; cymes 

 much branched, many-flowered. Outer bracteas foliaceous : 

 inner ones subulate. Leaves petiolate. 



1 P. INCA'NUM (Michx. fl. bor. amer. 2. p. 7.) leaves on 

 short petioles, ovate-oblong, acute, remotely serrated, rounded 

 at the base, pubescent, clothed with white tomentum beneath ; 

 whorls many-flowered, dense, cymose ; bracteas linear, or the 

 outer ones are lanceolate ; calycine teeth acute, a little awned, 

 nearly equal. 7. H. Native of North America, in corn- 

 fields and among bushes from Canada to Carolina. Origanum 

 incanum, Walt. fl. car. p. 165. ? Clinopodium incanum, Lin. 

 spec. p. 822. Dill. elth. 1. p. 87. t. 74. Plant pubescent. 

 Leaves 1^ inch long. Corollas whitish, tinged with red. Sta- 

 mens exserted. 



Hoary Pychnanthemum. Fl. July, Oct. Clt. 1732. PL 1^ 

 to 3 feet. 



2 P. TU'LLIA (Benth. lab. p. 328.) leaves petiolate, oblong, 

 acute, a little serrated, narrowed at the base, pubescent on both 

 surfaces, pale beneath ; whorls many-flowered, cymose ; brac- 

 teas linear : outer ones oblong, awned ; calyx bilabiate : teeth 

 acute, a little awned ; corolla glabrous inside. 7{. . H. Native 

 of Tenessee. Tullia pychnamhemoides, Leavenworth, in Sill, 

 amer. journ. sc. vol. 20. p. 343. t. 5. Plant pubescent. Leaves 

 2 inches long. Tube of corolla a little longer than the calyx. 

 Stamens exserted. 



Tullia Pychnanthemum. PL 1J foot. 



3 P. LOMI'SII (Nutt. acad. nat. sc. phil. 7. p. 100.) leaves 

 petiolate, ovate, somewhat serrated, acute, short, glabrous above; 

 flowers cymose, propped by many bracteas ; bracteas lanceolate, 



