Re: Adelonema

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Hi Marek, and other aroid-l folks,

 

Tom as nicely summed up the situation; allow me to put some more meat on the bones.

 

 

We have two independent sets of molecular data that show convincingly that the Neotropical species currently assigned to Homalomena do not belong there NOR do they belong in Philodendron – as had been suggested by a previous study [Molecular phylogeny of the genus Philodendron (Araceae): delimitation and infrageneric classification - [Botanical Journal of the Linnean Society 156: 13–27] - Gauthier, Barabé & Bruneau 2008].

 

The ‘coarse’ detail is a molecular clock study by Nauheimer et al, which gives dates the diversification of the Neotropical and Paleotropical clades at a minimum of ca 75 MYA.

 

The ’fine detail’ comes from a molecular study we’ve done in Malaysia as part of our work on the “true” Homalomena species. This paper is in prep. now, a spin-off from the phylogeny work done by two of our Master’s projects (Ng Kiaw Kiaw – who works on chemical profiling - and Hoe Yin Chen, who’s working on pollination and floral fragrance analyses).

 

While Curmeria is ‘better known’, the earliest name is Schott’s Adelonema.

 

The published accepted names (<dates>) involved for the Neotropics are:

 

 

Adelonema		Schott	Prodr. Syst. Aroid.: 316	1860
[T] Adelonema	erythropus	(Mart. ex Schott) Schott	Prodr. Syst. Aroid.: 317	1860
Caladium	erythropus	Mart. ex Engl.	Fl. Bras. 3(2): 172	1878
Curmeria		Linden & André	Ill. Hort. 20: 45, t.121	1873
Curmeria	picta	auct.	Gard. Chron., n.s., 1874: 92	1874
[T] Curmeria	picturata	Linden & André	Ill. Hort. 20: 45, t.121	1873
Curmeria	roezelii	Mast.	Gard. Chron., n.s., 1874(2): 804	1874
Curmeria	wallisii	(Regel) Mast.	Gard. Chron., n.s., 1877(1): 108	1877
Homalomena	crinipes	Engl.	Bot. Jahrb. Syst. 37: 124	1905
Homalomena	erythropus	(Mart. ex Schott) Engl.	Pflanzenr., 55(IV.23Da): 130	1912
Homalomena	erythropus subsp. allenii	Croat	Aroideana 27: 131	2004
Homalomena	hammelii	Croat & Grayum	Phytologia 82(1): 37	1997
Homalomena	kvistii	Croat	Aroideana 27: 135	2004
Homalomena	moffleriana	Croat & Grayum	Aroideana 27: 137	2004
Homalomena	peltata	Mast.	Gard. Chron., n.s., 1877(?): 273	1877
Homalomena	picturata	(Linden & André) Regel	Gartenflora 26: 33	1877
Homalomena	roezelii	(Mast.) Regel	Gartenflora 26: 33	1877
Homalomena	speariae	Bogner & Moffler	Aroideana 7: 37	1984
Homalomena	wallisii	Regel	Gartenflora	1877
Homalomena	wendlandii	Schott	Prodr. Syst. Aroid.: 308	1860

 

Bold non-italic text are currently accepted species. All of these names above in Homalomena will be combined into Adelonema. Tom has also three new species, and a new variety of H. (A.) crinipes.

 

Non-bold italics are synonyms

 

[T] = type species for the genus

 

Adelonema will comprise 16 taxa.

 

One additional Neotropical ‘Homalomena’, H. solimoensis G.M.Barroso [Arch. Jard. Bot. Rio de Janeiro 15: 89 1957] was moved to Philodendron by Eduardo as: Philodendron humile E.G.Gonç.

 

Peter