Leo A. Martin
Sun, 21 Jul 2013 11:24:35 PDT
Shawn Pollard donated Amoreuxia gonzalezii and A. palmatifida to BX 320 last year. They
are native to southern Arizona and northern Sonora, Mexico. A. g. is known from only 2
populations in the US, with perhaps less than 100 individuals total. A. p. is more
common. There is one more species in the US, A. wrightii from Texas. If any of you in
Texas have this, it would be nice add to the BX.

I planted 4 A. palmatifida and 5 A. gonzalezii seeds in late August 2012. As I reported
in my August 29 2012 message to the list, one A. g. sprouted and three A. p. They grew
last year and went dormant.

This spring we had warm weather by mid March and I began watering all my warm growers.
Nothing sprouted in the Amoreuxia containers. I was worrying until I recalled they
respond to monsoon conditions. Our monsoon normally begins around the second week of

I continued watering and they sprouted in early June, before our monsoon arrived. All 4
plants returned. They grew strongly and A. gonzalezii bloomed for the first time July 18
2013. I saw the flower on my way to the truck to go to work so I didn't have time to
photograph it. By the time I returned it was almost closed. Since then we have had rain,
which spoiled the open flowers, or I have not had time to take a photo but I will try to
do so.

The others formed buds but the buds aborted. The A. palmatifida plants are not as large
as the A. gonzalezii, and perhaps I didn't water them enough. Both species are still
growing well and forming new buds. The inflorescence is a curved cyme, with one flower
opening per day.

They seem to open in the wee hours of the morning, and close by evening. I tried to self
the first flower but it seemed there was no pollen, even after crushing the anthers.
Maybe the pollen dried and died shortly after anthesis. The flowers are an apricot
yellowish orange; this is a color that frequently denotes beetle pollination, and many
such flowers require some crushing of the anthers to release pollen. Those of you
growing yellow-flowered Uncarina spp can keep this in mind. I am sure Tim Harvey could
expand on this.

I am going to try and make some seed for the BX. These are really beautiful plants with
a large flower for their size.

I used 5 gallon containers filled with native soil because they have very long roots,
like a carrot. I wanted to grow them in the same container for years. I bought a
seedling A. palmatifida some years ago in a 2" / 5cm diameter container; I didn't
understand how it grows and it died when I didn't water it enough. I would guess once
the roots are larger the plant would be very drought tolerant.

Leo Martin
Phoenix Arizona USA

Leo Martin

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