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Re: [Aroid-I) Syngonium macrophyllum - ID

  • Subject: Re: [Aroid-I) Syngonium macrophyllum - ID
  • From: Helmut Reisenberger <gartenbaureisenberger@web.de>
  • Date: Wed, 17 Sep 2008 08:26:58 +0200

Dear Tom, Dear All,

May I direct a new question to esp. Tom: 
I once got a stem (1 cm diam.) of - obviously - Syngonium macrophyllum from the collection of the Austrian Federal Gardens (formerly the reknown "Imperial Gardens"). I was told, it was a strange hybrid of indefinite origin, that has "happened" around 1900. Meanwhile I have learned, it must be Syngonium macrophyllum ref. also to images of the juvenile leaves. But the distinct development of triparte adult leaves - as shown on the pictures - is confusing me. I have been growing this plant now for a couple of years. It is an extensive grower and easy to be multiplied by cuttings. By the time the juvenile leaves have become bigger and bigger and there never had been any sign of producing "adult" leaves. The juvenile heartshaped leaveblades are now more than 75 cm long and about 45 cm wide.
At any cut of the stem or leaf there is a lot of white sap running out. Is it normal thet the juvenile leaves get that big without turning to the adult version, or has there really something strange "happened" in the Imperial Gardens at the beginning of the 20th century? 


> -----Ursprüngliche Nachricht-----
> Von: "Tom Croat" <Thomas.Croat@mobot.org>
> Gesendet: 16.09.08 06:46:00
> An: "Discussion of aroids" <aroid-l@gizmoworks.com>
> Betreff: Re: [Aroid-l] Anthurium ID

> Dear Steve:
> While I still consider A. balaoanum a distinct species it may prove 
> to be merely an ecotype of A. dolichostachyum. I know it only from 
> the drier parts of Ecuador and it is a much smaller plant with longer,
> more slender internodes and thinner leaves as well as a smaller, 
> thinner spadix with a very ephemeral spathe. However, no feature is 
> qualatively different from A. dolichostachyum so perhaps the latter 
> species simply has a wide ecological and altitudinal range. 
> Tom
>  *From:* aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@
> gizmoworks.com]  *On Behalf Of *ExoticRainforest
>  *Sent:* Saturday, September 13, 2008 5:32 PM
>  *To:* Discussion of aroids
>  *Subject:* [Aroid-l] Anthurium ID
> Leland, your knowledge of aroids far outweighs my own but I thought 
> everyone who is an  /Anthurium/ enthusiast might like to read some of 
> Tom's notes taken from TROPICOS. Perhaps you can compare these to 
> your plant and determine if your specimen is truly  /Anthurium 
> balaoanum./ For those unfamiliar, the numbers at the beginning are Dr.
> Croat's specimen numbers. Tom once explained in a series of personal 
> emails that many people believe  /Anthurium balaoanum/ is  /Anthurium 
> guildingii/.  /A. balaoanum/ is from Ecuador and  /Anthurium 
> guildingii/ is from the lower eastern Caribbean and as you know both 
> plants are very different.
> If your plant is  /Anthurium balaoanum/ I'd love to have a photo of 
> the plant as well as the spathe to add to my webpage http://www.
> exoticrainforest.com/Anthurium%20balaoanum%20pc.html
> Steve
> #53706 Internodes short, 1.5-2 cm diam.; the roots ca. 5 mm diam., 
> mostly directed downward; cataphyll lanceolate, 3-4 cm long; petiole 
> 3-sided, broadly and sharply sulcate adaxially, sharply angular 
> abaxially, the ridge usually markedly asperous; geniculum ca. 1 cm 
> long; blades coriaceous, dark green, matte; the midrib narrow, obtuse,
> the lateral veins obscure; the lower surface slightly paler; the 
> midrib sharply acute, prominently raised; the primary veins 
> moderately obscure, slightly darker than the surface; inflorescences 
> erect; the peduncle terete, asperous, tinged purple; spathe green, 
> reflexed-spreading, moderately thin; spadix maroon turning brown, the 
> pollen whitish. 
> #50719 Epiphytic; stem to ca 1 m long, internodes 1-1.5 cm long, 1-1.
> 3 cm diameter; cataphylls deciduous; petiole terete; sterile; 
> flowered in cultivation, spathe absent, spadix sessile, yellow-green, 
> broadly arched, more or less tapered, stamens exserted, pollen pale 
> yellow. 
> #73144 Terrestrial; internodes dark green; petioles obtusely 
> flattened and weakly sulcate; blades subvelvety and weakly glossy 
> above, much paler and glossy below, midrib acute and concolorous 
> above, round-raised below; inflorescence erect; spathe green, 
> deciduous; spadix yellow-green, moderately glossy. 
> #90395 Stems elongated to 1 m long; internodes short 2 cm diam.; 
> petioles subterete, obtusely and weakly sulcate, weakly glossy, 
> weakly flattened toward base; blade thinly coriaceous, dark green and 
> matte-subvelvety above, slightly paler and weakly glossy below; 
> midrib narrowly raised, bluntly acute, slightly paler above, narrowly 
> round-raised and moderately paler below; primary lateral veins weakly 
> paler, acute in shallow valley above bluntly and narrowly raised, 
> paler below; tertiary vein in part weakly raised. 
> Dear Steve,
> Aloha.
> My plant is past blooming this year, I believe...but I will do so. I 
> think my plant must be something other than Anthurium balaoanum, if 
> Dr. Croat's notes on the spadix are correct and diagnostic.
> Aloha,
> Leland
>  _______________________________________________ Aroid-L mailing list 
> Aroid-L@www.gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/
> aroid-l 

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