Sizemoreae Begonia

Basic Information

Common Name: Sizemoreae Begonia

Scientific Name: Begonia sizemoreae

Native Habitat: Guangxi, China

History / Discovery / Cultivator

Begonia sizemoreae is a fascinating species endemic to the Guangxi Zhuang Autonomous Region in southern China. The plant was formally described and named in 2002 by Ching I Peng, Shin-Ming Ku, and Yao-Yi Yin in the journal Botanical Bulletin of Academia Sinica. The species name, sizemoreae, honors the late Dr. Marie L. Sizemore, an American botanist known for her contributions to the study of Begoniaceae. Dr. Sizemore dedicated significant efforts to understanding and documenting Begonia species, and naming this relatively rare Chinese species after her acknowledges her importance within the botanical community.

The discovery of Begonia sizemoreae highlights the rich biodiversity found in the karst regions of Guangxi. These unique landscapes, characterized by dramatic limestone formations, cliffs, and caves, provide specialized habitats that often harbor endemic plant species. The discovery and description of B. sizemoreae adds to the understanding of the Begonia genus and its distribution.

As a relatively recent discovery, Begonia sizemoreae isn’t widely cultivated compared to more established Begonia species and cultivars. However, its attractive foliage has garnered attention among Begonia enthusiasts. The exact details of the first cultivation attempts are difficult to pinpoint precisely. Plant collectors and specialist nurseries interested in rare and unusual species have likely played a role in bringing it into cultivation. The species’ introduction into cultivation is probably attributed to botanists sharing specimens collected during expeditions.

Propagation of Begonia sizemoreae is probably a significant factor in expanding its availability in the horticultural trade. The plant’s relatively slow growth can contribute to its rarity and higher price point. Specialist growers focused on Begonias are likely involved in tissue culture propagation to meet demand.

While the plant’s history is relatively short compared to other well-known begonias, its discovery contributes to a greater understanding of the biodiversity of China. As its popularity grows, more information about its specific cultivation needs is becoming available, enabling more people to enjoy its unique beauty. The continuing study of its natural habitat contributes to the conservation efforts that protect it and the surrounding ecosystem.

Plant Care Summary

Botanical Insights

Adaptations

Begonia sizemoreae exhibits several adaptations that allow it to thrive in its native karst environment. Its preference for shady, humid conditions reflects the understory habitat where it grows, protected from intense sunlight. The plant’s rhizomatous growth habit, where it spreads horizontally via underground stems, enables it to colonize suitable patches within the rocky terrain. Further research might reveal other unique adaptations related to nutrient uptake from the limestone substrate or specialized water conservation strategies. Its leaves are also fairly thick to reduce water loss in a humid environment.

Propagation Methods

Begonia sizemoreae can be propagated through several methods:

• Stem Cuttings: A common method. Take stem cuttings with a few leaves, allow the cut end to callous over for a day or two, and then plant in a well-draining potting mix.
• Leaf Cuttings: Similar to other begonias, leaf cuttings can be used. Cut a leaf into sections, ensuring each section includes a vein. Place these sections on a moist substrate.
• Rhizome Division: For established plants, dividing the rhizome can be an effective propagation method. Carefully separate the rhizome into sections, ensuring each section has roots and growth points.

Toxicology

Begonia sizemoreae, like many begonias, contains soluble oxalates. These compounds can cause irritation to the mouth, tongue, and throat if ingested. Symptoms may include excessive drooling, vomiting, and difficulty swallowing. While the toxicity is generally considered mild, it’s best to keep the plant out of reach of children and pets. If ingestion is suspected, rinse the mouth with water and consult a physician or veterinarian.

Common Problems

Pests:

• Mealybugs
• Spider mites
• Aphids

Diseases:

• Powdery mildew
• Root rot
• Botrytis blight (Gray Mold)

Other:

• Leaf yellowing: Often due to overwatering or poor drainage.
• Browning leaf tips: Can be caused by low humidity or excessive fertilizer.
• Leggy growth: Insufficient light.

Rarity & Value

Rarity:

Begonia sizemoreae is considered relatively rare due to its limited natural habitat in specific regions of Guangxi, China. Its relatively recent discovery and introduction into cultivation also contribute to its scarcity. Slow growth rates and challenging propagation can also restrict its availability in the market. Demand from collectors of unusual and rare begonias can further elevate its perceived rarity.

Value:

Several factors influence the market value of Begonia sizemoreae. Size and maturity of the plant are primary factors, with larger, well-established specimens commanding higher prices. Healthy, vibrant foliage free from blemishes also increases its value. Given the plant is rare, its provenance, as well as that of the nursery that propagated it, are extremely valuable. Collector interest and trends in the rare plant market also influence value, as the most unusual or difficult-to-obtain specimens are highly sought after.