LABIATAE (MINT FAMILY) 701 



1. B. NIGRA L, (Black Horehound.) More or less hairy, but green, erect ; 

 the root perennial ; leaves ovate, toothed ; whorls many-flowered, dense ; calyx- 

 teeth 6, longer than the tube of the purplish corolla. — Waste places, N. E., Pa., 

 etc., rare. (Nat. from Eu.) 



19. STACHYS [Tourn.] L. Hedge Nettle 



Corolla not dilated at the throat ; upper lip erect or rather spreading, often 

 arched, entire or nearly so ; the lower usually longer and spreading, .3-lobed, 

 with the middle lobe largest and nearly entire. Stamens 4, ascending under the 

 upper lip (often reflexed on the throat after flowering); anthers approximate in 

 l^airs. Nutlets obtuse, not truncate. — Whorls 2-many-flowered, approximate 

 in a terminal raceme or spike (whence the name, from ffrdxvs, a spike). 



a. Annuals. 



Stem smoothish ; corolla yellow, much exceeding- the calyx . . , \. S. annua. 

 Stem hirsute ; corolla purplish, about equaling the calyx . . . 2. & a/rven^s. 

 a. Perennials h. 



b. Stems glabrous on the sides, smooth or bristly on the angles c. 

 c. Calyx-teeth triangular-lanceolate, about equaling the tube. 



Leaves entire or obscurely toothed, linear or linear-oblong . . 3. <S. hyssopifolia. 

 Leaves regularly serrate or serrulate. 

 Leaves 5-13 ram. broad, their petioles 1-8 mm. long . . . 4. S. ambigua. 

 Leaves broader, their petioles 5-15(-20) mm. long. 

 Leaves rounded-truncate to cuneate at base, acute or merely 



acuminate at tip 5. ^S". tenuifolia. 



Leaves heart-shaped at base; caudate-acuminate at tip . . 6. »?. Nuttallii. 

 c. Calj'x-teeth broadly deltoid, much shorter than the tube . . , 1, S. latidens. 

 h. Stems pubescent (or puberulent) on the sides as well as on the angles. 



Leaves linear to linear-lanceolate, 10-12 times as long as broad . . %. S. ar'enicola. 

 Leaves broader, oblong to cordate-ovate. 

 Leaves subsessile or very short-petioled, the lower petioles not 



conspicuoush' longer than the upper 9. 8. palustris. 



Lower leaves on elongate petioles, the upper on shorter petioles or 

 subsessile. 

 Calyx-teeth broad-deltoid, much shorter than the tube . . 10. S. cordaia. 



Calyx-teeth lance-deltoid, nearly equaling the tube . . .11. S. salvioides. 



1. S. X.NXUA L. Erect smoothish annual ; leaves oblong to oblanceolate, the 

 lower crenate, the upper subentire ; calyx pilose and glandular-puberulent, 6-8 

 mm. long, the subequal lanceolate lobes about equaling the tube ; corolla yellow^ 

 1.5 cm. long. — Waste places and ballast, chiefly alK)ut Atlantic ports. July, 

 Aug. (Adv. from Eu.) 



2. S. ARVENsis L. Low decumbent annual; stems hirsute; leaves ovate, 

 crenate, subcordate, hirsute, the lower long-petioled ; calyx 4.5-6 mm. long, 

 hirsute, about equaling the purplish corolla. — Waste places and ballast, chiefly 

 near Atlantic ports. (Adv. from Eu.) 



3. S. hyssopifblia Michx. Smooth and glabrous, or the nodes hirsute ; stems 

 slender. 2-5 dm, high ; leaves linear-oblong or narrowly linear., sessile, entire or 

 obscurely toothed toioard the apex, 2-5 cm. long, 3-10 mm. wide ; whorls 4-6- 

 flowered, rather distant ; corolla twice or thrice the length of the triangular- 

 awl-shaped spreading calyx-teeth. — Wet sandy places, Mass. to Ela. ; s. Mich. 

 July-Sept. 



4. S. ambigua (Gray) Britton. Resembling the preceding, but stouter, with 

 scattered retrorse bristles on the angles of the stem, and with serrulate leaves 

 about 1 cm. broad. {S. hyssopifolia, var. Gray.) — Pa. to Wise, and southw 

 June-Aug. 



5. S. tenuifolia Willd. Rootstock slender; stem slender, smooth and gla- 

 brous throughout, or with few minute bristles on the angles ; leaves lanceolate 

 to oblong, taper-pointed, sharply toothed, mostly 5-10 cm. long, short-petioled, 

 only the lower floral longer than the flowers ; spike .slender and interrupted ; 

 calyx glabrous, the tube rather .slender, the lance-subulate tr<th somewhat 

 spreading. {S. aspera, var. glabra Gray.) — Wet ground, N. Y. to la., and 

 southw. 



Var. aspera (Michx.) Fernald. Angles of fhe stem beset ri'ith long re.Hexed 

 bristles; leares oblong- to ovate-lanceolate, short-petioled, more or less hairy; 



