1	"Shrub, < 1.5 m"	2
1	"Annual, < 1 m"	3
2	"Corolla tube 9--14 mm; inflorescence hairs 2--3 mm, obscuring pedicel"	"Trichostema lanatum"
2	"Corolla tube 4--7 mm; inflorescence hairs 1--2 mm, not obscuring pedicel"	"Trichostema parishii"
3	"Petiole distinct, 5--15 mm"	4
3	"Petiole indistinct or < 5 mm"	5
4	"Corolla tube 4--8 mm, exserted, lower lip 4--7 mm"	"Trichostema laxum"
4	"Corolla tube 1.5--3 mm, included, lower lip 2--3 mm"	"Trichostema simulatum"
5	"Corolla tube curved abruptly upward near throat; stamens 5--20 mm"	6
5	"Corolla tube curved gradually upward; stamens 2--6 mm"	8
6	"Stamens 5--9 mm"	"Trichostema ruygtii"
6	"Stamens 11--20 mm"	7
7	"Leaf blade 2--7 cm, lanceolate to narrowly ovate, length > 3 &times; width; corolla tube 5--10 mm"	"Trichostema lanceolatum"
7	"Leaf blade 1--2 cm, ovate, length < 2 &times; width; corolla tube 2.5--5.5 mm"	"Trichostema ovatum"
8	"Stem, leaf hairs curled to appressed; stamens 2--3 mm, +- included to +- exserted"	"Trichostema micranthum"
8	"Stem, leaf hairs straight, generally spreading; stamens 3--6 mm, exserted"	9
9	"Calyx lobes < 2 &times; tube; calyx tube > mature nutlets; mature calyx generally red-tinged"	"Trichostema rubisepalum"
9	"Calyx lobes > 2 &times; tube; calyx tube < mature nutlets; mature calyx green"	10
10	"Leaf blade widely elliptic, length generally < 4 &times; width; calyx lobes generally widest above base"	"Trichostema oblongum"
10	"Leaf blade elliptic, length generally > 4 &times; width; calyx lobes widest at base"	11
11	"Leaf <= internode above"	"Trichostema austromontanum subsp. austromontanum"
11	"Leaf >> internode above"	"Trichostema austromontanum subsp. compactum"