Begonia beijnenii: Difference between revisions

**Quick Species Info**
Species	Begonia beijnenii
Region	San Vicente, Palawan, the Philippines
Country	Philippines
Year published	2020
Date of Origin	19 January, 2020
Plant Type	Rhizomatous
Section	Baryandra
Chr 2n

Revision as of 13:24, 20 October 2023

Species Information

Classification and Distribution

Begonia beijnenii is endemic to San Vicente, Palawan. The main population occurs on exposed limestone rocks of a waterfall in a deeply shaded forest, often seen growing along Codonoboea woodii Merr. At least two other sub-populations have been observed occurring in several disturbed areas nearby.

Habitat

The species primarily grows on exposed limestone rocks of a waterfall in a deeply shaded forest.

Characteristics

Begonia beijnenii is characterized by several distinctive features. Its rhizome is creeping, colored green to maroon, with a length of about 40 mm and a thickness of 3–4 mm. The stipules, which are pale green and triangular, remain persistent and grow to 11–14 mm in length and 4–5 mm in width. These stipules curve with age and have a keeled structure, a cuspidate apex measuring 4–5 mm, and mostly feature a smooth margin, though occasionally a single straight hair may be present near the attachment to the petiole. The leaves are alternate and have terete, maroon petioles with a length ranging from 22 to 88 mm and a thickness of 1.5–2.5 mm. Over time, the petioles elongate, becoming covered in linear white tomentose hair, especially towards the lamina. The leaf lamina is subrhomboid and succulent, appearing mostly glabrous, except for a few hairs near the petiole attachment. While most individuals exhibit dark patches on interveins and margins, some display an entirely green adaxial surface. The abaxial surface varies from pale green to maroon, with slightly raised veins featuring minute pilose hairs measuring 0.5–1 mm. The inflorescence is axillary, protandrous, and branches cymosely 3–4 times, forming a 9–14 cm long panicle. The peduncle measures 6–9.6 cm in length. Additionally, the bracts are boat-shaped with an acute apex, glabrous, and have an entire margin. The lowest bract measures 4.5 mm × 3.5 mm.

Flower Details

In terms of its floral characteristics, Begonia beijnenii exhibits staminate flowers with four pale pink, glabrous tepals. The outer tepals are orbicular with rounded apices, measuring 6.5 mm × 7.5 mm, while the inner tepals are obovate with slightly retuse apices, measuring 7 mm × 4.5 mm. The androecium comprises 28–32 stamens, with filaments measuring 1–1.5 mm and free from one another. The anthers are yellow, approximately 1 mm long, oblong-oblanceolate, with lateral slits, and the connective extends to the apex with a blunt protrusion. In contrast, the pistillate flowers also feature four pale pink, glabrous tepals. The outer tepal is orbicular with a rounded apex, measuring 6 mm × 7 mm, while the inner tepal is obovate with a slightly retuse apex, measuring 7 mm × 3.5 mm. The pistillate flowers have three styles, which are shortly fused at the base, measuring 3 mm in length, spiraled and covered with papillose hairs. The greenish-pink ovary is glabrous and trigonous-ellipsoid, measuring 6–8 mm × 2–3 mm (excluding the wings). It is adorned with three unequal wings featuring entire margins. The largest wing is lunate, distally bluntly truncated, proximally rounded, and notably cucullate, measuring approximately 4–7 mm in width. The fruit is pendent and shares similar dimensions with the ovary. It bends in such a way that the largest wing points downwards, while two lateral wings create a splash cup effect. The fruit dehisces along the attachment of the two lateral wings.

Etymology

This begonia is named after conservationist and biologist Mr. Jonah van Beijnen, who first discovered and reported about the species. It is also named in acknowledgment of his conservation efforts across Palawan, particularly his advocacy to raise The Cleopatra’s Needle Mountain Range to protected area status.

Comparison to Similar Species

Begonia beijnenii is most allied to B. hughesii, as it bears a 3-winged ovary with a cucullate wing and an abortive abaxial locule. It has tormentose petiole vestiture, glabrous adaxial leaf surface, and subglabrous abaxial leaf surface. However, Begonia beijnenii is distinctively smaller in size compared to B. hughesii.

References

   Links to references used on this page

Photos

File:Begonia beijnenii.jpg

Begonia beijnenii and source

External Links

   Links to pages related to this species

@@ Line 27: / Line 27: @@
 ==== Characteristics ====
-Begonia beijnenii exhibits the following key characteristics:
+Begonia beijnenii is characterized by several distinctive features. Its rhizome is creeping, colored green to maroon, with a length of about 40 mm and a thickness of 3–4 mm. The stipules, which are pale green and triangular, remain persistent and grow to 11–14 mm in length and 4–5 mm in width. These stipules curve with age and have a keeled structure, a cuspidate apex measuring 4–5 mm, and mostly feature a smooth margin, though occasionally a single straight hair may be present near the attachment to the petiole. The leaves are alternate and have terete, maroon petioles with a length ranging from 22 to 88 mm and a thickness of 1.5–2.5 mm. Over time, the petioles elongate, becoming covered in linear white tomentose hair, especially towards the lamina. The leaf lamina is subrhomboid and succulent, appearing mostly glabrous, except for a few hairs near the petiole attachment. While most individuals exhibit dark patches on interveins and margins, some display an entirely green adaxial surface. The abaxial surface varies from pale green to maroon, with slightly raised veins featuring minute pilose hairs measuring 0.5–1 mm. The inflorescence is axillary, protandrous, and branches cymosely 3–4 times, forming a 9–14 cm long panicle. The peduncle measures 6–9.6 cm in length. Additionally, the bracts are boat-shaped with an acute apex, glabrous, and have an entire margin. The lowest bract measures 4.5 mm × 3.5 mm.
-Rhizome: It has a creeping, green to maroon rhizome, measuring 40 mm in length and 3–4 mm in thickness. The rhizome is sparsely hirsute (0.5–1 mm long) with internodes measuring 2–2.5 mm.
-Stipules: These stipules are persistent, pale green, triangular, and become recurved with age. They measure 11–14 mm in length and 4–5 mm in width. The stipules are keeled, have a cuspidate apex (cusp measuring 4–5 mm), and mostly feature a glabrous margin, except for an occasional single straight hair near the attachment with the petiole.
-Leaves: The leaves are alternate with terete, maroon petioles, ranging from 22 to 88 mm in length and 1.5–2.5 mm in thickness. Over time, the petioles elongate, and they are covered in white tomentose hair, with the hair becoming more linear towards the lamina.
-Leaf Lamina: The leaf lamina is subrhomboid and asymmetrical, succulent, and mostly glabrous, except for a few hairs near the petiole attachment. Most individuals have dark patches on interveins and margins, while some individuals have an entirely green adaxial surface. The abaxial surface is pale green to maroon, with veins slightly raised and featuring minute pilose hairs (0.5–1 mm long).
-Inflorescence: The inflorescence is axillary, protandrous, cymosely branching 3–4 times, forming a panicle that is 9–14 cm long. The peduncle measures 6–9.6 cm in length.
-Bracts: The bracts are boat-shaped, with an acute apex. They are glabrous and have an entire margin. The lowest bract measures 4.5 mm × 3.5 mm.
-Staminate Flower: The staminate flower features four pale pink tepals that are glabrous. The outer tepals are orbicular with a rounded apex, measuring 6.5 mm × 7.5 mm, while the inner tepals are obovate with a slightly retuse apex, measuring 7 mm × 4.5 mm. The androecium measures 3.5 mm across, with 28–32 stamens. The filaments are free and 1–1.5 mm long. The anthers are yellow, approximately 1 mm long, oblong-oblanceolate, with lateral slits. The connective extends to the apex and is bluntly protruding.
-Pistillate Flower: The pistillate flower also features four pale pink tepals that are glabrous. The outer tepal is orbicular with a rounded apex, measuring 6 mm × 7 mm, while the inner tepal is obovate with a slightly retuse apex, measuring 7 mm × 3.5 mm. There are three styles, shortly fused at the base, measuring 3 mm in length, spiraled and papillose all around. The ovary is greenish-pink, glabrous, trigonous-ellipsoid, measuring 6–8 mm × 2–3 mm (wings excluded). It has three unequal wings with entire margins. The largest wing is lunate, distally bluntly truncated, proximally rounded, and markedly cucullate, measuring approximately 4–7 mm wide.
-Fruit: The fruit is pendent and has dimensions similar to the ovary. It is recurved in a way that the largest wing points downwards, and two lateral wings form a splash cup. The fruit dehisces along the attachment of the two lateral wings.
 ==== Flower Details ====
+In terms of its floral characteristics, Begonia beijnenii exhibits staminate flowers with four pale pink, glabrous tepals. The outer tepals are orbicular with rounded apices, measuring 6.5 mm × 7.5 mm, while the inner tepals are obovate with slightly retuse apices, measuring 7 mm × 4.5 mm. The androecium comprises 28–32 stamens, with filaments measuring 1–1.5 mm and free from one another. The anthers are yellow, approximately 1 mm long, oblong-oblanceolate, with lateral slits, and the connective extends to the apex with a blunt protrusion. In contrast, the pistillate flowers also feature four pale pink, glabrous tepals. The outer tepal is orbicular with a rounded apex, measuring 6 mm × 7 mm, while the inner tepal is obovate with a slightly retuse apex, measuring 7 mm × 3.5 mm. The pistillate flowers have three styles, which are shortly fused at the base, measuring 3 mm in length, spiraled and covered with papillose hairs. The greenish-pink ovary is glabrous and trigonous-ellipsoid, measuring 6–8 mm × 2–3 mm (excluding the wings). It is adorned with three unequal wings featuring entire margins. The largest wing is lunate, distally bluntly truncated, proximally rounded, and notably cucullate, measuring approximately 4–7 mm in width. The fruit is pendent and shares similar dimensions with the ovary. It bends in such a way that the largest wing points downwards, while two lateral wings create a splash cup effect. The fruit dehisces along the attachment of the two lateral wings.
 ==== Etymology ====