Crassula ovata (jade plant).

Ah, the common jade plant. I used to really love this type of shrubby succulent, but now I find them a bore. My grandmother had a large one on her front porch when I was a child. I would occasionally take cuttings off of her plant, but was rarely successful in getting them to root even though it is typically tremendously easy. In San Francisco these thing grow like weeds in yards and even in cracks in the pavement. That is probably why I have lost interest in them--if it is too easy to grow or too common, why would I want one?

Crassula ovata are in the crassula (stonecrop) family. This is the largest family in the saxifragales, and also includes our friends Aeonium, Dudleya, Kalanchoe, and Sedum. Crussula is the Latin diminutive for thick (an obvious reference to the thick appearance of these little buggers). Ovata is also Latin, and is easy to remember as it is describing the plant's egg-shapped (or ovate) leaves.

This guy stays alive despite my neglect. I never ever remember to water it. I think the only reason it is alive is due to its placement on the floor in front of my fish tank. I'm convinced the fish (that I never remember to feed) spit water on the jade at night. I have a similar sized one at work that looks worse than this guy. It is actually the only thing I have kept alive at work, because I refuse to water things when I'm on the job. Jade plants are very easy to root. You don't even need a stem cutting, even a leaf will root if left on moist soil. One fun thing to note, if you can recall your freshman biology course (7.014). CAM (Crassulacean Acid Metabolism) photosynthesis is named for this family of succulents. Many xerophytes are CAM plants. They fix carbon at night when the temperature is lower. This allows them to keep their stomata closed during the day to prevent water loss. Fun, fun, fun!

Synsepalum dulcificum (miracle fruit plant).

On to something a little more exotic . . . something miraculous?

I first heard about the miracle fruit a couple of years ago, although it has been known to the western world for almost 300 years. I'm still amazed how few people have heard about it. I guess in my little scientific circle and in my greater San Francisco community (where even the most stiff collared of us are still more or less hippies) the miracle fruit has become quite popular. There was even a New York Times article a while back about this little marvel.

Quite simply, miracle fruit makes your tongue hallucinate. Eat a miracle fruit, and for the next half hour anything sour that you eat will taste sweet. Lemons, pickles, Tabasco, bad cheese. This is all thanks to a taste-modifying protein, aptly named miraculin, present in the fruit. The current thinking is that this protein binds to and alters the sweet receptors on taste buds, causing them to be stimulated by acids (sour flavors). One would think that a lot of research would have been performed on miraculin; however, only a couple of dozen research papers have been published on this subject since the late 60s.

Miracle fruit plant originated in western Africa. It is a member of the sapote family, which contains a number of species of excellent fruit trees. Synsepalum means together-sepal from the Greek syn and the Latin sepalum. Apparently the flowers have five fused sepals. Dulcificum is Latin for sweet-fig.

I have to confess two things. First, I have not actually tried a miracle fruit; however, I have several friends that have taken part in miracle fruit parties (where people eat the fruit and then sample various foods). I am waiting until my plants bear fruit in order to try this witchcraft. Second, I bought these seeds. I know, I know, I know, how horrible. That is completely against my ethic of stealing . . . I mean appropriating plants, but I could find no other way to get my hands on one. Miracle fruits, by the way, are the size of a cranberry, go for about $3 apiece, and do not store at all. You basically have to eat them within one to two days of picking them. Also the seed is only viable for about the same length of time. I bought a dozen (they sent me a baker's dozen) seeds for about $7 from a place in SoCal.

I planted my seeds in a 50:50 mix of peat moss and perlite. The plants need acidic soil, so the peat is really a must. I had 3 seeds germinate (23% germination rate), which is a typical yield for miracle fruit seeds. Even though my seeds were cleaned and sent to me overnight from the nursery, a little mold was already present on them. They were quick to mold in the pot but that didn't seem to have much of an effect on germination. After about a month, I had three sprouts. They are very hardy. I have heard that they grow very slowly their first year and then take off. Currently mine are 10 months old. For the first 9 months they hardly grew but now they put out a new leaf every other week or so. Thus far my guys are about 2-4 inches tall.

They are supposed to do well in indoor pots and will fruit when they are 2-3 years old (when they are about a foot tall). Even small plants can produce a high number of berries. I'm excited, but hopefully the novelty won't wear off after a while. If I get a regular crop of fruit I may try to sell them. We'll see.

Euphorbia pulcherrima (poinsettia).

Euphorbia pulcherrima are extremely popular, and are practically ubiquitous around the holidays. The common name, poinsettia, is often mispronounced (pointsettia . . . poinsetta . . . ). They are named after Joel Poinsett, a US congressman and Secretary of War under Van Buren. Poinsett was also the US Minister to Mexico (where the poinsettia is native) and is responsible for introducing the plant to the US in the late 1820s. Euphorbia are part of the spurge family (Euphorbiaceae). Sap from spurges are purgatives, thus they make you espurge (Latin).

The following is a bit of a digression, but I find it interesting. The genus Euphorbia is named after Euphorbus, the personal physician of Juba II king of Numidia (Algeria and Tunisia) and then of Mauretania (western Algeria and Morocco, not to be confused with Mauritania the modern country). Juba II was married twice. Once to Cleopatra Selene II (the only daughter of Cleopatra) and then to Glaphyra a princess of Cappadocia (eastern Anatolia). Glaphyra was actually married to one of Herod's sons before Juba II but then later dumped Juba II for another one of Herod's sons. I guess she had a type. Anyway, Juba went on an exploration to the Canary Islands off of northwestern Africa. He allegedly named the islands Canaria (using the Latin word for dogs) because they found dogs on the island (which may actually have been a now-extinct type of monk seal). On the islands he documented a type of spurge which he later wrote a book about, titled Euporbia after his physician. The species name pulcherrima simply means beautiful in Latin. Ta-da!!!

We bought this poinsettia before Christmas in 2008 and we barely manage to keep it alive. The soil it is planted in (that it came with) does not retain water at all. It needs to be watered more often than I can can keep up with, so this chap is constantly wilted. It is also constantly dropping leaves, but it still manages to hold onto a reasonable amount of foliage. To get a poinsettia to flower, you need to put it in pitch-black dark at night for several months. I didn't learn that trick until late November last year so I haven't had the opportunity to try it out. Maybe we will in 2010.

Poinsettia flowers are small and yellow, and are surrounded by the bright red bracts (leaves) that people often confuse with the flower (bougainvillea bracts are similarly confused with their flowers). I was surprised to learn that the association of poinsettias with Christmas is an old tradition dating back to the 16th century in Mexico. They became popularized in the 17th century when Franciscan friars began using poinsettias in nativity scenes.

It is a common misconception that poinsettias are poisonous. I'm not a particular fan of these plants, especially since I learned they aren't toxic, but the leaves are attractive and I think my wife would get upset if I left it on the street corner.