Also posted at Madprofessah.Com

Aloe haworthioides (Baker, Central Madagascar) has been blooming for over a week. It’s diminutive at just 3 inches across.

Aloe haworthioides Baker, 3" pot, in full fragrant bloom. Flowers smell sweet, almost like orange blossoms.

Flowers are a big draw in the yard even if you’re like me, more of a foliage lover. Flowers are a sign the plant is doing well, of its fitness for… well… sex. Today was New Year’s Day and the weather was 80 degrees F and sunny, so the winter flowers were heavy with scent.

Aloe haworthioides startled me with the delicious sweetness of its fragrance. You have to sniff very close, but then it smells gorgeous.

Aloe haworthioides flower closeup

The genus Aloe practically defines the pursuit of defining genus of cactus and succulent culture. You can grow giant tree aloes up to 15 meters in height—Aloe barberae, Aloe pillansii, Aloe dichotoma, just to name 3. I have humble specimens of all three, and I love them.

To Aloe barberae‘s dragon, Aloe haworthioides is a dragonfly .

Aloe haworthioides, closeup of 3" body

Aloe haworthioides is named for the resemblance to its cousins in genus Haworthia. This resemblance is not coincidence; Aloe and Haworthia are genetically close and they hybridize easily.

Speaking of hybridizing, Aloe haworthioides is often used in aloe breeding. Its beauty and promiscuity are also drawbacks: many plants billed and sold as Aloe haworthioides are actually careless crosses from uncontrolled pollination. Sounds sexy… but be careful out there!

In the wild, it makes its home in the central mountains of Madagascar at an altitude of 1200-1800 m above sea level. Although a slow grower, it forms offsets and can reportedly be propagated by cuttings, i.e. removing these offsets.

Aloe haworthioides is stemless, perennial and herbaceous.

Here’s are some more technical details, cribbed from Peter Lapshin’s site. (Someone—Saturn, Santa, or Satan—needs to bring me the new comprehensive book on the genus, Aloes: The Definitive Guide.)

Each plant body has up to 100 leaves, 3–4 cm long, approximately 6 mm wide, gray-green with white buds, arranged  in a dense rosette diameter of 4-5 cm, leaf margins with harmless white hairs or spines. Flower stems 20-30 cm tall, flowers fragrant, white or pale pink, 6-8 mm in length.

Aloe haworthioides from Peter Lapshin's site, http://www.lapshin.org/succulent/o-al-haw.htm

See Also

Aloe haworthioides at Peter Lapshin’s site

Aloe haworthioides at Dave’s Garden PlantFiles

Aloe haworthioides at Cactus-Art.Biz

Haworthia tessellata 'Neat' shooting a bloom stalk. Can you see the windows in the leaf tops?

Haworthia tessellata is one of my favorite plants. At least that’s what I tell people. One friend has complained that I say that about so many plants that it can’t possibly be true.

The latin name tessellata comes from the tiled pattern in the leaf faces. Attractive, yes, but the bigger truth about these odd, waxy leaf faces is this: they evolved to be natural windows. Many Haworthia have adapted this way. Sunlight enters the plant body through these translucent windows and is converted into energy by many layers of chlorophyll-rich cells.

Haworthia limifolia, a close relative of H tessellata but lacking obvious windows in its leaves. It resembles opaque, molded plastic rather than translucent, carved wax.

This is especially useful in the arid climates where Haworthia tessellata makes its living; the primary photosynthesis tissues are not exposed to the drying elements.

Haworthia tessellata 'Fang', a select clone named for the teeth and tubercles on the leaf undersides.

Leaves with window tops are described as fenestrate, from the Latin for window: fenestra.

Haworthia tessellata 'Super Tessellata', a beautiful, select clone

What’s more, like many succulents, Haworthia tessellata can photosynthesize using Crassulacean Acid Metabolism (CAM). During CAM photosynthesis, the plant opens its stomata only during the cool of the night. It “inhales” in carbon dioxide and stores it in its thick, succulent tissues (while “exhaling” oxygen). During the heat of the day, the carbon dioxide stored deep in the plant can be used in photosynthesis because sunlight passes through the leaf windows, deep into the center of each leaf.

Haworthia tessellata (synonym Haworthia venosa ssp tessellata) is found many places in Southern Africa, especially central South Africa, also extending northward into Namibia. This stemless plant sends underground stolons up to 14cm (5.5 inches) away from the mother plant. This vegetative reproduction results in a mat of plants, and also makes it easier to propagate of select clones such as those pictured here.

See Also

Convergent Evolution in Succulent Desert Plants: Comparing Haworthia and Aloe (Africa) With Agave (America)

Breuer, Ingo. (2010). The Genus Haworthia – Book 1. Alsterworthia International. Softcover, Illustrated, 86 pages. ISBN 13: 9780955272677.
Breuer classifies Haworthia tessellata as a separate species, disagreeing with Bayer, who calls it a subspecies of Haworthia venosa.

Bayer, Bruce. (2003). Haworthia Update – Volume 1. Umdaus Press. Hardcover, Illustrated, 64 pages. ISBN 10: 1919766219

Court, Doreen. (Third Edition, 2010). Succulent Flora of Southern Africa. Cape Town, South Africa: Struik Publishers. ISBN-10: 1770075879. ISBN-13: 978-1770075870.