I have one C. lastelliana and one C. leptocheilos and the differences are fairly noticeable at this stage. The leptochelios is ID’d from comparing it to other palms labeled as such and the lastelliana was bought from Floribunda as a seedling. I guess some of the differences could be variation but I just dont have the experience to know for sure. I’ve never been able to tell the mature ones apart for certain. I’ve heard lepto is not as robust or that their fronds dip below 90 deg or they are less erect etc. Anyway, I thought it might be interesting to put these young palms side by side. Does anyone agree or disagree that these two are regular examples of their species? 
 

lastelliana on the left. Its leaflets seem more blunt and wider than leptocheilos. The petioles are also longer. 

The stem of leptocheilos has more tomentum and It showed up much earlier. This lastelliana also has light mealy bug markings. 

Other than observing the differences and noticing that they are healthy looking , I can’t help. I have zero experience with either of these. They look happy! Harry

They are very much like mine. The mealybug markings on my lastelliana (both of mine are Floribunda plants) is much more apparent on the newest spear just as on the first that originated in Hawaii.  The leptocheilos does not have that color at all, it seems almost dull by comparison. The leaves are also larger on the lastelliana by an appreciable amount, almost twice the length but i think the new spear will likey be shorter like many others i just got acclimated.  The photo is from about a month ago the spear is much longer now and still colorful.

37 minutes ago, flplantguy said:

They are very much like mine. The mealybug markings on my lastelliana (both of mine are Floribunda plants) is much more apparent on the newest spear just as on the first that originated in Hawaii.  The leptocheilos does not have that color at all, it seems almost dull by comparison. The leaves are also larger on the lastelliana by an appreciable amount, almost twice the length but i think the new spear will likey be shorter like many others i just got acclimated.  The photo is from about a month ago the spear is much longer now and still colorful.

Yours even has some red in it, nice! It definitely has the same high contrast leaf bases on it. Is your lepto generally darker then your lastelliana? 

 

I will have to get some updated pictures later in daylight. I think the leptocheilos has redder fuzz but less of it, the lastelliana has dark thick fuzz but i thought it was supposed to be red also. Only the spear seems to have the color on it so i think its temporary.  I like teddies when i have seen them, so if the redneck lives up to its name im excited to see it mature so i can compare.

Also the teddy seems to be darker in foliage as well just like yours is.  The redneck is a spring green color (i have been surprised at the leaf color variation in some of the plants i have)

I took some photos this evening of the redneck and teddy bear together. Under the cover of another frond they are both quite colorful and dont look different there yet, maybe a slight difference but the bigger one is the spear. They are very different in these two, and the redneck has the mealybug/rhubarb red pattern going well up the spear. 

The fronds themselves are also shown with the size and color difference. The redneck palm puts more into each frond and has only opened one while the teddy has opened two and is well into a third.  That may change over summer, the spear is picking up speed on the redneck and i have heard that teddies like the cooler months more here.  These photos were just after watering also.

5 minutes ago, flplantguy said:

I took some photos this evening of the redneck and teddy bear together. Under the cover of another frond they are both quite colorful and dont look different there yet, maybe a slight difference but the bigger one is the spear. They are very different in these two, and the redneck has the mealybug/rhubarb red pattern going well up the spear. 

The fronds themselves are also shown with the size and color difference. The redneck palm puts more into each frond and has only opened one while the teddy has opened two and is well into a third.  That may change over summer, the spear is picking up speed on the redneck and i have heard that teddies like the cooler months more here.  These photos were just after watering also.

Thanks for taking those pics! I can see similar differences in those as well. Similar differences? 🙄 

Good info I think. I feel like I can ID a young plant with some confidence now. 

Thank you for your useful information. I'm trying to figure out how to differentiate between a Redneck and a Teddy bear. From the method you suggested, from the 2 plants in my picture, I think A is a Redneck and B is a Teddy bear. Am I understanding this correctly? Please help give advice. Thank you.

On the adult palms I recall the redneck leaves on the petiole(leaf stem) start closer to the trunk while the teddy has a longer bare part of the petiole adjacent to the trunk.  Looks like these seedlings may follow suit there.  Leaf color can be all over with small potted teddys, I grew 6 last few years.  The ones I have in sun are more yellow those in in shade more green.  Teddys are also lighter green, more yellowish in the event of even a mild Mg deficiency.

@Alexberm To me (not an expert) those both look like Teddy Bears or C leptochelios. The reason I say that is it looks like the tomentum extends up the petiole and even on to the rachis on both of those. The leaflets look narrower with a slow taper to the tip.  Also as noted earlier when describing these palms and as mentioned by @sonoranfans the petioles seem to be longer on lastelliana and these look fairly short. 

it may be more apparent with the next few leaves too with the new petiole (if mine showing color is typical). Your possible red neck looks like it may have the pattern starting to show but its too early and the leaves are smaller to me so it could go either way. It is also younger than mine so that could be part of it.