Tag Archives: monotypic genus

A Mound of Mitama

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Cryptomeria is a monotypic genus (only one species) of conifer, native to Japan. Despite many reports that it hails from China, DNA has shown that these were brought from Japan and planted over 1000 years ago.

For over 40 years, we have been fascinated with the genus and have worked to collect as many cultivars as possible, currently 49 different ones in the garden. One of our long-time favorites is Cryptomeria japonica ‘Mitama’, an old Japanese dwarf selection that’s sold under the name ‘Globosa Nana’. Without any clipping, these retain a slightly informal green meatball shape, maturing at 6′ tall x 10′ wide. Below is our garden plant this week. Hardiness zone 5a to 9b.

An unpruned specimen of Cryptomeria japonica 'Mitama', commonly sold under the name 'Globosa Nana'.
Cryptomeria japonica ‘Mitama’

Frosty Pearl

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One of our favorite broadleaf shrubs is undoubtedly Orixa japonica ‘Pearl Frost’. Orixa is a monotypic (one species) genus in the citrus (Rutaceae) family, that’s virtually unknown in US gardens.

We are particularly enamored with this superb variegated form, brought into the US by plantsman Barry Yinger. Orixa ‘Pearl Frost’ matures at 8′ tall x 6′ wide, and we have found it to thrive in both full sun to light shade, although full sun plants require more moisture.

Image of Orixa japonica Pearl Frost
Orixa japonica ‘Pearl Frost’

Asparagus kissin’ cousin

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Ok…raise your hand if you’ve grown Aphyllanthes monspeliensis? This odd, monotypic (only member of the genus) is actually a member of the Asparagus family. Hailing from France south into Northern Africa, Aphyllanthes can be found growing in hot, dry, sandy soils, where it produces an amazing spring show of blue flowers on a 1′ tall clumper. The species name “monspeliensis” is named after Montpellier, France, where it grows naturally. Our plants are thriving in our crevice garden, putting on a superb flower show in mid-April.

Have you met Helonias?

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Spring 2021 marked our first flowering of the monotypic (only one member of the genus) helonias. This threatened US native, occurs in scattered locations from NY south to Georgia, but is rarely offered commercially. We had good seed set, and now fingers are crossed for equally good germination. Helonias requires saturated ground, and ours is now thriving with pitcher plants and other moisture lovers. Hopefully one day, propagation will allow us to share this gem.