Dicranostegia is a monotypic genus of hemiparasitic flowering plants belonging to the family Orobanchaceae,[3] containing the species Dicranostegia orcuttiana, commonly known as Orcutt's bird's beak or Baja bird's beak.[4] It is near-endemic to Baja California, found from Miller's Landing north to Tijuana,[5] but has a few occurrences in southern San Diego County, California. It is differentiated among other similar species (like Cordylanthus spp.) in California by its leaves with 8 to 11 lateral lobes that are paired.[6] It was formerly placed in the genus Cordylanthus until phylogenetic analysis led to it being split off.[7] This species is threatened by the destruction of its habitat from urbanization.[4]
| Dicranostegia | |
|---|---|
| |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Lamiales |
| Family: | Orobanchaceae |
| Tribe: | Pedicularideae |
| Subtribe: | Castillejinae |
| Genus: | Dicranostegia (A.Gray) Pennell |
| Species: | D. orcuttiana
|
| Binomial name | |
| Dicranostegia orcuttiana (A.Gray) Pennell, 1947
| |
| Synonyms[2] | |
| |
Description
editThis annual hemiparasitic herb grows to 10–50 centimetres (3.9–19.7 in) in height and is green with dark-red markings, and often coated in stiff hairs. The roots are mostly yellowish in color, and form haustoria on their finer branches. The leaves are pinnately divided, arranged alternately, and are sessile. The pinnate leaves are lobed 8–11 times, and are 3–6 centimetres (1.2–2.4 in) long.[4][7]
The inflorescence is a very dense cluster of flowers (an elongated spike) surrounded by leaf-like outer bracts. The inflorescence is 2–10 centimetres (0.79–3.94 in) tall. The inner bracts are 15–25 millimetres (0.59–0.98 in) long and lobe 3–7 times, shaped lance-oblong. The corolla of each flower is up to 25 mm (0.98 in) long and is made up of a club-shaped, yellow-tipped white fibrous pouch, enclosed by a sheath-like calyx of around half the length of the corolla.[4][7]
Distribution and habitat
editThis species is present in both the United States and Mexico. In Mexico, it is found in the state of Baja California, from Miller's Landing in the central part of the state north to Tijuana.[5] In the United States, this species is found in San Diego County, California, where it occurs in the southern part of the county, in the Otay River valley, the Tijuana Hills, and the Tijuana River valley. It was once present further north in San Diego County, notably in Rice Canyon and Greg Rogers Park in Chula Vista, but these occurrences have been extirpated to make way for residential development.[6] In California, this species has a state rank of S1 (Critically Imperiled), and a CNPS Rare Plant Inventory rank of 2B.1 (Seriously threatened in California but common elsewhere).[8]
This species is most often found growing in a riparian habitat. In the Tijuana River valley, it can be found in a cobbly ecotone with coastal sage scrub above with Baccharis thickets and southern willow scrub (Salix lasiolepis and associates) near the water. The former occurrence in Chula Vista at Greg Rogers Park has a substrate of Reiff fine sandy loam. In the Otay River area, this species is found on Holocene alluviums and river-wash.[6]
Gallery
edit-
The plant in August -
The plant with inflorescences -
The inflorescence -
In habitat -
The inflorescence in a hand
References
edit- ^ "Cordylanthus orcuttianus". NatureServe Explorer. Arlington, Virginia: NatureServe. 2022. Retrieved 24 March 2022.
- ^ "Dicranostegia orcuttiana". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 24 March 2022.
- ^ "Dicranostegia (A.Gray) Pennell | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 14 May 2021.
- ^ a b c d Wetherwax, Margriet; Tank, David C. (2012). "Dicranostegia orcuttiana". Jepson eFlora. Jepson Flora Project. Retrieved 24 March 2022.
- ^ a b Rebman, J. P.; Gibson, J.; Rich, K. (2016). "Annotated checklist of the vascular plants of Baja California, Mexico" (PDF). San Diego Society of Natural History. 45: 212.
- ^ a b c Reiser, Craig H. (July 2001). Rare Plants of San Diego County (PDF). Imperial Beach, CA: Aquafir Press. pp. 81–82. ASIN B0006F4BAY.
- ^ a b c Tank, David C.; Egger, J. Mark; Olmstead, Richard G. (2009). "Phylogenetic Classification of Subtribe Castillejinae (Orobanchaceae)". Systematic Botany. 34 (1): 182–197. doi:10.1600/036364409787602357. ISSN 0363-6445. JSTOR 40211879. S2CID 15577936.
- ^ "Dicranostegia orcuttiana". Rare Plant Inventory (v9-01 1.5 online ed.). California Native Plant Society, Rare Plant Program. 2022. Retrieved 25 March 2022.