DIDYNAMIA, GYMNOSPERMIA. 
SI 
In similar places with the two preceding* plants ; very com- 
mon. Flowers white, or very pale-purple. Perennial. July. 
Mentha viridis, or common spear-mint, and Mentha piperita, 
or common pepper-mint, are frequently found in wet mea- 
dows near springs and rivulets, where they have been plant- 
ed, or found their way from gardens ; but they are not pro- 
peidy naturalized. 
266. HYSSOPUS. Gen. pi. 963. {Labiatce.) 
Lower lip of the Corolla 3 -parted^ inter- 
mediate segment subcrenate. Stamina 
straight^ and distant.— 
1. H. spikes verticillate, cylindrical ; styles short- 
^Hbr than the corolla; leaves subcordate, ovate- 
acuminate, acutely dentate. — Willd. and Fursh, 
Icon. Pluk. aim. t. 150. f. 3. Jacq. hort. 1. 1. 
69. (Pursh.) 
Catmint Hyssop. Tall Hyssop. 
A very tall plant, often flowering at a height of two feet, 
but frequently attaining a stature of six. Flowers in long 
dense spikes, ochroleucous. I have seen them purple, though 
rarely. In thickets, shady woods, hedges, and on the borders 
of fields, common, particularly six or ten miles from the city. 
Perennial. July. 
£. H. spikes verticillate, cylindric ; styles longer 
than the corolla ; leaves cordate-ovate, acumi- 
nate, obtusely dentate. — Willcl. and Pursh. 
Agastache, Gronovius, FI. Virg. 88. 
Icon. Herm. parad. t. 106. 
A very rare plant, easily known from the preceding. From 
fourteen inches to two feet high. Flowers purple. On the 
banks of the Delaware, Jersey side, on the walk from Kaighn’s 
point to the next ferry below, close to a shady thicket. Pe- 
rennial. July. 
267. NEPETA. Gen. pi. 964. (Labiata.) 
Calix arid, striated. Tube of the Corolla 
longish ; intermediate segment of the lower 
