Arisaema species NV4

Section Sinarisaema.

Some time ago I was kindly given 5 pots of Arisaema seedlings, originally grown from seeds collected in Lao Cai province in North West Vietnam above Sapa. They were collected at around 2000m or more on Y Ti mountain in wet forest habitat. I labelled the seedlings NV1, 2, 3, 4 and 5 (NV = Northern Vietnam). Some of the plants are starting to flower and key characteristics are shown here.

NV4 is clearly a member of Section Sinarisaema. It bears a very strong resemblance to Arisaema consanguineum, and I initially assumed this was a clone of that species, however, the leaflets are slightly petioluate, especially the leading leaflet. This feature is not known in Arisaema consanguineum as far as I know.

Plants form a tall pseudostem. Most plants display an attractive mottled patterning, although others are plain green. At this stage, only male flowers have been produced and plants have one leaf.

The spathe is green with pale green vertical stripes, and the spathe hood ends in a long pointed tip. The photos below show the male inflorescence. The spadix is cylindrical with a rounded tip and sessile (ie, non-stipitate where it joins the floral section). Just one or two neuters are present immediately above the male flowers. Male flowers are purple and have an oblong pore.

All these features point towards Arisaema consanguineum apart from the petiolulate leaflets. These are present in another species from Northern Vietnam, Arisaema parisifolia. However, the spadix is far too thick to fit that species.

Tuber:

The tuber is subglobose and forms sessile offsets in abundance.

Seeds and germination:

Unknown. However, other Sinarisaema show no significant loss of viability when stored dry.

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