Lectotypus: Stelis melanoxantha Rchb.f. 
Stelis Subgen. Inaequales Garay in Can.Journ.Bot. 34: 351, 
1956. 
Stelis Sect. Valvae Garay in Can. Journ.Bot. 34: 351,1956. 
Typus: Humboldtia purpurea Ruiz & Pav. 
Flores bilabiatae. Sepalum posticum a sepalis lateralibus 
valde diversum. Sepala lateralia inter se pro parte connata, in 
natura saepissime usque ad apicem conniventia. 
Roman numerals I to XI which appear under each illustration 
are designating subgenera or sections. Arabic numerals repre- 
sent alliances within sections. The habit of plant whether caespI- 
tose or rhizomatous is represented by a small “c” or 
ABBREVIATIONS 
SUBGENERA AND SECTIONS 
respectively. 
] = Subgen. Nexipous 
Il =Subgen. Dialissa 
III =Sect. Pedales 
IV =Sect. Distichae, 1—4 
V = Sect. Rhomboideae, 5-6 
VI =Sect. Monostachyae 
VII =Sect. Isochilae, 7-8 
VIII = Sect. Chasmostelis, 9-12 
IX =Sect. Labiatae, 13-14 
x = Sect. Concavae, 15-19 
XI =Subgen. Stelis, 20-22 
ALLIANCES AND GROUPS 
1=S. disticha alliance 
2=S. columnaris alliance 
3 = S. purpurascens alliance 
4=S. elatior alliance 
5 = S. rhomboidea alliance 
6=S. Fendleri alliance 
18] 
angustifolia 12 
apiculata 8 
aprica 15 
ascendens 7 
aviceps 22b 
brevilabris 14 
