the level of adnation of the filaments to the corolla tube. Lepto- 
glossis linifolia is unique in this respect, because its very short 
filaments are adnate to the base of the enlarged distal sector of the 
corolla tube (PI. V. M: Pl. VI, K,O, T); on the contrary, the other 
SIX species display long filaments adnate up to halfway of the 
corolla tube or at lower levels (PI. IV, K; Pl. V, A. K). The pollen 
grains are separated in all the species of the genus. The disk is 
usually conspicuous, large, fleshy and with a bright reddish- 
orange colour. 
Gametic chromosome number: n = 10 (Subils, 1979: 19) 
Zygotic chromosome number: n = 20 (Diers, 1961: 451) 
Diagnostic features at the species level.—L. lomana and L. 
acutiloba are the only species in the genus with two kinds of 
leaves: the basal ones (with a long petiole and a broad blade) 
forming a rosette at ground level, and the cauline ones (sessile and 
with a linear blade). The other five species, on the contrary, 
exhibit only cauline leaves, either with long petioles and broad 
blades (PI. IV, C, D), or sessile with narrow blades (PI. VI, B, L). 
The pubescence of stems, leaves and calyces is another useful 
character for diagnostic purposes: 1. Darcyvana, L. Ferrevraei 
and L. /omana show predominantly branched hairs (Pl. IV, B, H, 
J); L. albiflora, on the other hand, displays only simple hairs (PI. 
V, D). In L. schwenckioides both simple and glandular hairs are 
noted (PI. V, L,O). When capitate hairs are present, the head and 
the foot may be either unicellular or pluricellular (Pl. V, O, P: Pl. 
VI, A). Another noteworthy feature, the slightly arcuate hairs, is 
known only in L. acutiloba (Pl. V, E, F). The calyx is, as a rule, 
actinomorphic and S5-cleft (Pl. IV, G, I; Pl. V, N), the only 
exception being L. a/biflora, with a zygomorphic and 7-10-cleft 
calyx (Pl. V, B). 
KEY TO THE SPECIES 
|. Filaments inserted at the middle or low part of the narrow portion of the 
corolla tube. Calyx 5-cleft, actinomorphic, or 7-10-cleft and 7zygomorphic. 
2. Calyx 5-cleft, actinomorphic; plants with or without a rosette of leaves. 
3. Herbs with stems lignified at lower part. Leaves cauline: the rosette 
leaves wanting. 
4. Hairs simple and capitate. Plants (0.1) 0.3-1 min height. Flowers in 
lax cymes aggregated on lateral branches, forming false racemes. 
LANGA SOS Ueucu. daa klay iene s-caeeae eee |. L. schwenckioides 
