Is this a type of Pritchardia?

[BayAndroid]

Spotted these today on the Stanford University campus. What are they? 

[BayAndroid]

Sorry about the upside down photos, I'm not sure what to do about that. 

[John2468]

Looks like Livistona to me.

[richnorm]

Livistona not Pritchardia which are thornless.

[Jim in Los Altos]

Livistona chinensis

[DoomsDave]

@BayAndroid I concur with @Jim in Los Altos - those are Livistona chinensis.

[quaman58]

1 hour ago, DoomsDave said:

@BayAndroid I concur with @Jim in Los Altos - those are Livistona chinensis.

Me too!!

[BayAndroid]

Thanks guys. It crossed my mind that they were in fact armed, but the spines were smaller than I thought for a Livistona Chinensis. 

[Harry’s Palms]

1 hour ago, BayAndroid said:

Thanks guys. It crossed my mind that they were in fact armed, but the spines were smaller than I thought for a Livistona Chinensis. 

Some shade grown L. Chinensis are without teeth. The teeth on mine are viscous. Harry

[Jim in Los Altos]

5 hours ago, BayAndroid said:

Thanks guys. It crossed my mind that they were in fact armed, but the spines were smaller than I thought for a Livistona Chinensis. 

Most of my L. chinensis are completely unarmed. Some L. chinensis are armed, others are not. 

[Tracy]

5 hours ago, Jim in Los Altos said:

Most of my L. chinensis are completely unarmed. Some L. chinensis are armed, others are not. unarmed 

I didn't know that some Lc are unarmed, thank you for educating me,  Jim.    

The other side of the coin is that I am completely unaware of any Pritchardia which are armed, consequently it immediately ruled out Pritchardia as an id for the palms in question. 

[Jim in Los Altos]

6 hours ago, Tracy said:

I didn't know that some Lc are unarmed, thank you for educating me,  Jim.    

The other side of the coin is that I am completely unaware of any Pritchardia which are armed, consequently it immediately ruled out Pritchardia as an id for the palms in question. 

Tracy, Yes, all Pritchardia are unarmed. 

[Harry’s Palms]

You’re right Jim , but the edges of the petiole , even though they are smooth , can be sharp enough to give pause! Harry

[Fusca]

17 hours ago, Jim in Los Altos said:

Most of my L. chinensis are completely unarmed. Some L. chinensis are armed, others are not. 

I always wondered if this was due to genetic variation or due to age.  Every young plant and seedling that I've grown or purchased (small sample) had petiole thorns but trunking palms either had none or minimal thorns.  I have a trunking palm with thorns that are barely noticeable and a 3-year old seedling grown from that palm has larger thorns than the parent!  🤷‍♂️

[Jim in Los Altos]

5 hours ago, Fusca said:

I always wondered if this was due to genetic variation or due to age.  Every young plant and seedling that I've grown or purchased (small sample) had petiole thorns but trunking palms either had none or minimal thorns.  I have a trunking palm with thorns that are barely noticeable and a 3-year old seedling grown from that palm has larger thorns than the parent!  🤷‍♂️

My unarmed adult ones were also unarmed while juveniles. There’s a lot of variability in the species in this regard. 

[Jim in Los Altos]

6 hours ago, Harry’s Palms said:

You’re right Jim , but the edges of the petiole , even though they are smooth , can be sharp enough to give pause! Harry

Hmm, I’ve not noticed that on any of mine. Have you ever cut yourself on the edge of a petiole? I don’t wear gloves and have never been harmed by mine. 

[Harry’s Palms]

No never been cut but just feels sharp on the edge. . Mine pushes a large spear that actually is two or three fronds grouped as one spear. When the next frond to open separates from the spear just before opening is when I noticed the edge. I was tying up a frond with string to keep it from obstructing my pathway it felt sharp to the touch . I’m not sure it would actually cut through skin unless I ran my hand parallel to the edge , which I wouldn’t do. Harry