Camptocarpus semihastatus
Photograph of a herbarium specimen of Camptocarpus semihastatus[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Gentianales
Family: Apocynaceae
Genus: Camptocarpus
Species:
C. semihastatus
Binomial name
Camptocarpus semihastatus
Klack.
Synonyms[3]
  • Harpanema acuminatum Decne.

Camptocarpus semihastatus is a species of plant in the Apocynaceae family. It is native to Madagascar.[4] Jens Klackenberg,[5] the botanist who formally described the species named it after the distinct coronal lobes of its flowers that resemble half the head of a spear (hasta in Latin).[6][7]

Description

It is a climbing plant. Its elliptical to egg-shaped leaves are 3.5–7 by 1–3 millimeters. The tips of its leaves sometimes come to a long, tapering point. The bases of the leaves are wedge-shaped to tapering. Its petioles are 3–13 millimeters long. Its many flowered, branching Inflorescences occur at the junction between the leaves and stem. Each flower is on a pedicels that is 3–6 millimeters long. The pedicels have bracts that are 1 millimeter long. Its flowers have 5 hairless sepals that are connected at the base with broad, egg-shaped lobes that are 0.7–1 by 0.7–1 millimeters. The sepals have pointed tips. The 5 hairless, white to rose-colored petals are fused at their base to form a 0.8–1.2 millimeter tube with oblong lobes that are 2.8–3.4 by 1.1–1.6 millimeters. The petals have rounded tips. The flowers have a ring-like structure between the petals and its stamen called a corona. Its corona has 5 thread-like lobes that are 2–3 millimeters long with appendages at the top that point inwards. Its stamen have very short, 0.1 millimeter-long, filaments and 0.5–0.6 millimeter long anthers. The anthers have a recurved appendix at their base. The connective tissue between the chambers of the anther extends up into a rounded tip. Its pistils have broad, cone-shaped stigma.[2][7]

Reproductive biology

The pollen of Camptocarpus linearis is shed as permanent tetrads.[8]

Distribution and habitat

It has been observed growing in forest and shrub habitats at elevations of 500 to 1499 meters.[2][7]

References

  1. ↑ "Camptocarpus semihastatus Klack". Tropicos. Tropicos.org. Missouri Botanical Garden. n.d. Retrieved August 1, 2023.
  2. 1 2 3 Missouri Botanical Garden (2018). "Camptocarpus semihastatus". IUCN Red List of Threatened Species. 2018: e.T70102267A70123430. doi:10.2305/IUCN.UK.2018-2.RLTS.T70102267A70123430.en. Retrieved August 1, 2023.
  3. ↑ "Camptocarpus semihastatus Klack". Catalogue of Life. Species 2000. n.d. Retrieved August 1, 2023.
  4. ↑ "Camptocarpus semihastatus (Decne.) Klack". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved August 1, 2023.
  5. ↑ "Jens Klackenberg". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew; Harvard University Herbaria & Libraries; Australian National Botanic Gardens. Retrieved 2023-08-01.
  6. ↑ Stearn, William (2004). Botanical Latin. Portland, Ore. Newton Abbot: Timber Press David & Charles. ISBN 9780881926279.
  7. 1 2 3 Klackenberg, Jens (1998). "Taxonomy and phylogeny of the genus Camtocarpus s.l. (Periplocoideae, Asclepiadaceae)". Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie. 120: 45–85.
  8. ↑ Verhoeven, Rudolf L.; Venter, Johan T. (2001). "Pollen Morphology of the Periplocoideae, Secamonoideae, and Asclepiadoideae (Apocynaceae)". Annals of the Missouri Botanical Garden. 88 (4): 569–582. JSTOR 3298634.
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