Could you help to identify this cycads? Thank you

[Alexberm]

[John2468]

Dioon species, probably Dioon Spinulosum?

[Merlyn]

Yep, Dioon Spinulosum.

[Alexberm]

7 hours ago, John2468 said:

Dioon species, probably Dioon Spinulosum?

Thank you so much. before your answer, I’m thinking dioon mejiae.

[Merlyn]

47 minutes ago, Alexberm said:

Thank you so much. before your answer, I’m thinking dioon mejiae.

Mejiae is very similar, but they have "furry" petioles/rachis.  This is especially obvious when the plant flushes, but sometimes the fuzzy white/tan/brown hairs on the petioles fades over time.  Here's a good Mejiae example from RPS:

[happypalms]

Male Dioon spinolosum 

[wimmie]

Another question about Cycads, folks. What is, in young plants, the best visual difference between Cycas thouarsii and Cycas rumphi? The leaflets of the plant I bought as a rumphi is much more lush, more shiny than those of the thouarsii. Is that correct in your opinion? I will post some photo's tomorrow.

[Merlyn]

34 minutes ago, wimmie said:

Another question about Cycads, folks. What is, in young plants, the best visual difference between Cycas thouarsii and Cycas rumphi? The leaflets of the plant I bought as a rumphi is much more lush, more shiny than those of the thouarsii. Is that correct in your opinion? I will post some photo's tomorrow.

A few years ago I looked into the cosmetically similar species, and wrote down some ID notes.  The angles below are the insertion angle to the rachis, i.e. 45-60 degrees means swept forwards towards the tip of the frond:

• Circinalis 80-90 degree on rachis w/long tapering tip, raised rib above visible but flat below.
• Thouarsii 45-60 degrees with more rounded tip, shiny big grooved midrib top, pale w/ raised rib underside, bluish haze on new flush.
• Rumphii 90 deg leaves glossy green w/flat midrib above, very pale w/raised midrib below.
• Seemannii deep green 45-70 degrees midrib flat above and raised below.

[wimmie]

On 11/20/2023 at 5:47 PM, wimmie said:

Another question about Cycads, folks. What is, in young plants, the best visual difference between Cycas thouarsii and Cycas rumphi? The leaflets of the plant I bought as a rumphi is much more lush, more shiny than those of the thouarsii. Is that correct in your opinion? I will post some photo's tomorrow.

Folks, here are the photo's I promised to post. The first three are of the plant I bought as a rumphi, the other three are of the one I bought as a thouarsii. What do you think?

[happypalms]

4 hours ago, wimmie said:

Folks, here are the photo's I promised to post. The first three are of the plant I bought as a rumphi, the other three are of the one I bought as a thouarsii. What do you think?

Not sure but love the Metallica palm 

[wimmie]

Here are the photo's of the thouarsii.

[wimmie]

Are these indeed rumphi and thouarsii?

[Merlyn]

@wimmie hard to say for sure, but the "Thouarsii" seems pretty close.  The "Rumphii" looks like it has a raised rib top and bottom, so it *might* be something else like a Diannanensis or even Simplicipinna.  The ripply leaflets are common to all three, and even some others like Apoa.  I'm certainly not an ID expert, so take my suggestions as a vaguely educated guess. 

[wimmie]

Thanks, Merlyn.