344 LABIATE. (MINT FAMILY.) 



namely, the short teeth of the calyx upward, &c. Corolla blue, varying to pur- 

 ple, rarely white, small ; in summer and autumn. (Name composed of Qpl, 

 hair, and OTJ//ua, stamen, from the capillary filaments.) 



1. T. dich6tomum, L. (BASTARD PENNYROYAL.) Leaves lance-oblong 

 or rhombic-lanceolate, rarely lance-linear, short-petioled. Sandy fields, New 

 England to Kentucky, and southward, chiefly eastward. Stamens ' long. 

 Corolla blue : a pink variety near Hartford, Conn., C. H. Olmstead. 



2. T. lineare, Nutt. Leaves linear, nearly smooth. Sandy pine barrens 

 of New Jersey, and southward. More slender and less forked than the last. 



' 3 . ISANTHUS, Michx. FALSE PENNYROYAL. 



Calyx bell-shaped, 5-lobed, equal, enlarged in fruit. Corolla little longer than 

 the calyx ; the border bell-shaped, with 5 nearly equal and obovate spreading 

 lobes. Stamens 4, slightly didynamous, incurved-ascending, scarcely exceeding 

 the corolla. A low, much branched annual, clammy-pubescent, with nearly en- 

 tire lance-oblong 3-nerved leaves, and small pale blue flowers on axillary 1-3- 

 flowered peduncles. (Name from ros, equal, and avdos, flower, referring to the 

 almost regular corolla. ) 



1. I. CSeruleus, Michx. Gravelly banks and fields, Maine to Illinois, and 

 southward. July, Aug. Corolla 2" long. 



4. M^NTHA, L. MINT. 



Calyx bell-shaped or tubular, 5-toothed, equal or nearly so. Corolla with a 

 short included tube ; the bell-shaped border somewhat equally 4-cleft ; the upper 

 lobe broadest, entire or notched. Stamens 4, equal, erect, distant. Odorous 

 perennial herbs, with the sjnall flowers mostly in close clusters, forming axil- 

 lary capitate whorls, sometimes approximated in interrupted spikes ; produced 

 in summer ; of two sorts as to the length of the stamens in most species. 

 Corolla pale purple or whitish. (Mivdrj of Theophrastus, from a Nymph of that 

 name, fablefl to have been changed into Mint by the jealous Proserpine.) 

 # Inflorescence terminal, forming narrow 'spikes : leaves sessile or nearly so. 



1. M. ROTUNDIF6LIA, L. (ROUND-LEAVED MINT.) Soft-hairy or downy ; 

 leaves round-ovate and somewhat heart-shaped, rugose, crenate-toothed. Wet 

 places, Maine, J. Blake, New Jersey and Penn., Porter. (Adv. from Eu.) 



2. M. vfRiDis, L. (SPEARMINT.) Nearly smooth ; leaves oblong- or ovate- 

 lanceolate, unequally serrate. Wet places : common. (Nat. from Eu.) 



* * Inflorescence mostly terminal, forming interrupted spikes or heads: leaves petioled. 



3. M. PIPER|TA, L. (PEPPERMINT.) Smooth ; leaves ovate-oblong, acute ; 

 spikes loose. Var. SUBHIRSUTA, Benth., has the petioles, veins of the leaves, 

 &c. rather hairy. Low grounds/ and along brooks : less naturalized than the 

 last ; and like it multiplying rapidly by running under-ground shoots. (Nat. 

 from Eu.) 



4. M. AQITATICA, L. (WATER MINT.) Pubescent or smoothish ; leaves 

 ovate or round-ovate; flowers in a terminal globular or interrupted and oblong 

 head, often with one or more clusters in the axils of the upper leaves ; calyx and 



