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Tribe VII. Stamens 4, parallel and ascending under the galeate or concave upper 
lip, the outer pair longer: calyx 5 to 10-nerved or veiny, not 2-lipped (except in no. 
20). 
* Calyx reticulate-veiny, deeply 2-lipped, closed in fruit. 
20. Brazoria. Calyx mostly declined in fruit, with broad lips, the upper some- 
what recurved, the lowed turned upward in fruit. 
* * Calyx thin, inflated in fruit, obscurely nerved, 3 to 5-lobed, open. 
21. Physostegia. Calyx 5-toothed or 5-lobed: anther-cells parallel. 
*** Calyx of firmer texture, distinctly 5 to 10-nerved or striate, 5 to 10-toothed, 
+ Stamens included in short corola-tube, its upper lip merely concave. 
22, Marrubium. Calyx tubular, 5 to 10-nerved, and with 5 or 10 awl-shaped teeth. 
+ + Stamens ascending under the galeate upper lip of the corolla. 
23. Leonotis. Calyx tubular, 10-nerved, at length incurved above, oblique at 
orifice, and with 5 or more unequal spinulose-tipped teeth, the upper one largest: 
stamens not deflexed after blooming. 
24. Stachys. Calyx tubular-bell-shaped, 5 or 10-nerved, equally 5-toothed (some- 
times the upper teeth larger and more or less united): stamens often deflexed or 
contorted after blooming. 
1. TETRACLEA Gray. 
Minutely puberulent herb, with deeply 5-cleft regular calyx, nearly 
salverform corolla with similar and equally spreading lobes, 4 exserted 
stamens with anther-cells permanently parallel and distinct, and a 
barely 4-lobed ovary. 
1. T. Coulteri Gray. About 3 dm. high from a perennial root or suffrutescent 
base: leaves petioled, ovate, nearly entire: flowers 2 or 3 on the short axillary 
peduncles, short-pedicled, cream-colored.—Rocky hills, southern and western Texas, 
2. TRICHOSTEMA Gronov. (BLUE-CURLS.) 
Low annuals, with entire leaves, mostly solitary 1-flowered pedicels 
terminating the branches, bell-shaped oblique deeply 5-cleft calyx (3 
upper teeth elongated, 2 lower very short), 5-lobed corolla with declined 
nearly equal lobes, 4 curved much exserted stamens with divergent 
and at length confluent anther-cells, and a deeply 4-lobed ovary. 
1. T. dichotomum L. Viscid with rather minute pubescence: leaves lance-oblong 
or rhombic-lanceolate, rarely lance-linear, short-petioled.—Sandy fields, extending 
from the Atlantic region into Texas. Known as “ bastard pennyroyal.” 
3. ISANTHUS Michx. (FALSE PENNYROYAL.) 
Low much branched clammy-pubescent annual, with nearly entire 
lance-oblong 3-nerved leaves, small pale blue flowers on axillary 1 to 
3-flowered peduncles, bell-shaped 5-lobed equal calyx enlarged in fruit, 
corolla little longer than calyx with bell-shaped border and 5 nearly 
equal and obovate spreading lobes, and 4 slightly didynamous incurved- 
ascending stamens scarcely exceeding the corolla. 
1. I. brachiatus Britton. Corolla 4 to 6 mm. long, little exceeding the calyx. 
(I. ceruleus Michx.)—Dry or sterile ground, extending from the Atlantic region to 
southern Texas, 
