MINT FAMILY 519 
Ovary 2-celled with a single ovule in each cell. Style short. Fruit at 
length separating into 4 nutlets. 
L. lanceolata, Michx. (Fig. 9, pl. 129.) Fog Fruir. Stem procum- 
bent, rooting at the nodes, the erect part little if at all branched. Smooth 
or with a few hairs. Leaves opposite, lance-shaped, notched at margins. 
Flowers blue, in rounded heads. Moist soil, New Jersey, westward and 
southward. June-Aug. 
Famity II—LABIATAE. Mint Famity 
In our region all the labiates are herbs, with opposite leaves 
without stipules, generally the stem is 4-sided. Many of these 
herbs are aromatic. Flowers are, in general, irregular. The calyx, 
5-parted, is regular or irregular, in the latter case the divisions are 
more or less 2-lipped, the upper being of 3, the lower of 2 teeth. 
Corolla tubular, expanding above into 2 lips, the upper of 2 lobes 
which often coalesce to the extent of appearing as one; the lower 
of 3 distinct lobes. Stamens borne on the tube of the corolla, 
mostly 4, two of which are longer than the other two (didynam- 
ous). Sometimes the anterior (lower) pair is longer than the 
upper and less frequently the posterior (upper) “pair is longest. 
In a certain number of species one pair of stamens is sterile or 
absent. The pollen sacs are usually double, lying parallel with 
each other along the filament or diverging from each other, form- 
ing with the filament a sort of cross. The ovary is always above 
and free from the calyx; it is 4-lobed or deeply divided into 4 
parts. Fruit 4 one-seeded nutlets. 
1. The Mint Tribe 
Corolla of 4 nearly equal lobes, one of which is concave or plane 
at top. Stamens 4, 2 longer than the other pair. 
Stamens all fertile . . . Sie ret isl teagled |. oe ERNE: 
Two stamens fertile, two rudimentary eee ee XCORUS 
2. The Thyme Tribe 
Corolla clearly 2-lipped; the upper lip plane or feebly coneave; sta- 
mens 4, straight or divergent, the anterior or lower pair the 
longest. 
Wreeping. herb; leaves; very small) 20... 4 3... > Dyes 
Erect herbs. 
Calyx tubular, with 5 equal teeth, 15-nerved. Longest 
stamens extending much beyond the corolla. Leaf mar- 
gin not incised or toothed .. . . HyYssopus 
Calyx oval bell-shaped with 5 nearly equal teeth, 10- to 
13-nerved. 
Anther sacs divergent . . . . . . . . OBIGANUM 
Anther sacs parallel . . . . . . - PYCNANTHEMUM 
