DR. GRISEBACH ON COUTOUBEA VOLUBILIS. 143 
tendal (Bot. Zeit. xiii. p. 915) has republished, from a Mexican 
periodical, Schiede’s paper on two Mexican Erythree, and he 
describes a third considered as new by Schaffner : of these I possess 
two collected by Schaffner. His no. 15 (agreeing with E. diva- 
ricata, Schaffn.) is nothing but a broad-leaved form of the com- 
mon Æ. quitensis, Kth., a species ranging from the coast of 
Northern Mexico (Ervendberg, no. 186!) through the mountains 
of Guatemala (Wendl. !) and Costa Rica (Oerst.!): the original, 
lower form, with narrower leaves, was collected likewise in Gua- 
temala (Wendl. !), and grows besides in Venezuela (Moritz!) and 
Quito (Jameson!). In the diagnosis of E. tetramera, Schiede, 
I find nothing which would prevent me from referring it to E. qui- 
tensis. The second species sent by Schaffner (no. 13), or E. 
stricta, chiede, agrees with the description of E. floribunda, Benth. 
My E. Mihlenbergii was confined by Asa Gray to a species 
ranging from California to New Mexico, while he reduces the 
Pennsylvanian plant to the E. ramosissima, Pers., which he de- 
clares identical with the doubtful Exacum pulchellum, Pursh: 
this is undoubtedly a correct emendation, as Mr. Marsh found the 
true European species even as far south as Jamaica (probably 
introduced along the Atlantic with foreign grain). Among the 
doubtful Erythree, E. elodes, R. S., upon Godron's authority, is 
Elodes palustris; and to E. Massoni, Linn. (from an Azoric speci- 
men) may be reduced E. diffusa, Woods, which is apparently indeed 
perennial, as stated by Lejolis, though contradicted by Grenier. 
The distinction of the four remaining genera is more question- 
able, and I should now rather prefer regarding Microcala as a 
section of Cicendia; for an intermediate group of species (Steno- 
cala) would be formed by C. exaltata and by a new Guatemalan | 
species, discovered by Mr. Wendland, as appears from the follow- 
ing review of the genus. 
CrcENDIA. 
Sect. 1. Hippocentaurea, Reichenb. Calyx 4-5-partitus. 
- C. pusilla, Gr. (Syn. C. Candollei, Gr.) 
- C. Poeppigii, Gr. 
- C. fastigiata, Gr. 
w ou = 
Sect. 2. Stenocala. Calyx ad medium 4-fidus. 
- C. exaltata, Gr. 
. C. stricta, Gr. (n.sp.); caule gracili in pedunculas strictas ssepe 
unilaterales diviso, foliis inferioribus spathulato-lanceolatis obtusius- 
culis, superioribus linearibus decrescentibus, calycis lobis ovatos 
cou 
