Mandevilla brachysiphon
Mandevilla
Huachuca Mountain rocktrumpet, western rocktrumpet
[for john Henry mandeville, rocktrumpet
sparsely to densely eglandular-pubescent, especially on younger growth.
erect [trailing], unarmed, eglandular-pubescent or glabrate [glabrous].
opposite or subopposite, occasionally subverticillate;
petiole 1–2 mm, pubescent;
blade ovate-lanceolate to oblong-ovate, (8–)14–35 × (3.5–)6–15(–25) mm, subcoriaceous, base cuneate, rounded, or slightly cordate, margins not revolute, apex acute, acuminate, or rounded, apiculate, surfaces densely eglandular-pubescent abaxially, eglandular-pubescent adaxially.
deciduous [persistent], opposite, subopposite, or occasionally subverticillate [whorled], petiolate;
stipular colleters interpetiolar [absent];
laminar colleters present.
axillary, terminal, or subterminal, cymose, pedunculate or not.
0–1(–3) mm, pubescent.
7–15 mm, pubescent.
sepals reddish, oblong-ovate, 4–9 × 1–2.2 mm, pubescent;
corolla white, often tinged with pink or red, often greenish below, eglandular-pubescent abaxially and adaxially, tube 13–20(–25) × 1.5 mm, throat (11–)15–20(–25) × 4–5 mm, lobes spreading, obliquely ovate, (10–)15–25 × 10–20 mm.
calycine colleters present;
corolla yellow or white, often tinged with pink or red [pink, red, crimson, magenta, often with yellow eye], salverform, aestivation dextrorse;
corolline corona absent;
androecium and gynoecium not united into a gynostegium;
stamens inserted at top of corolla tube;
anthers connivent, adherent to stigma, connectives enlarged, truncate or 2-lobed, locules 4;
pollen free, not massed into pollinia, translators absent;
nectaries 2–5, distinct [connate and forming disc].
follicles, usually paired, erect or deflexed, brown to reddish brown, slender, terete or moniliform, surface smooth or striate, pubescent or glabrate [glabrous].
5–7 × 1–1.5 mm.
linear, flattened, not winged, not beaked, comose, not arillate.
1(or 2)-flowered.
55–120 × 4–5 mm, pubescent.
= 8, 10.
Mandevilla brachysiphon
Mandevilla
Mandevilla brachysiphon has the westernmost distribution of our species. Within the flora area, M. brachysiphon is known only from southeastern Arizona (Cochise, Graham, Pima, and Santa Cruz counties), southwestern New Mexico (Hidalgo and Luna counties), and the Franklin Mountains of El Paso County, Texas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species ca. 170 (5 in the flora).
Mandevilla is one of the largest genera of Apocynaceae, although until recently its generic delimitation has been somewhat controversial. As noted by A. O. Simões et al. (2006), the combination of great morphological diversity and wide geographic distribution has presented challenges to workers that have been reflected in the taxonomic history of the group.
The most widely accepted circumscription of Mandevilla was established by R. E. Woodson Jr. (1933), who treated the genus as comprising approximately 110 neotropical species divided into two subgenera, Exothostemon (G. Don) Woodson and Mandevilla, the latter comprising five sections. M. Pichon (1948) provided a revised treatment in which he recognized the subgenera of Woodson but proposed a new classification within subg. Mandevilla, recognizing four sections. Pichon also included Macrosiphonia in Mandevilla, arguing that the characters used by Woodson to separate these genera were arbitrary.
Until recently, few studies have examined relationships between Mandevilla and putatively related genera. J. L. Zarucchi (1991) described the monotypic genus Quiotania from northern Colombia, indicating that he felt it to be close to Mandevilla but commenting that it was not clear whether it was most closely related to Macrosiphonia, Mandevilla, or other neotropical genera such as Allomarkgrafia Woodson, Mesechites Müller Arg., or Tintinnabularia Woodson. J. Henrickson (1996b) elevated Macrosiphonia subg. Telosiphonia to generic status, noting that all of these genera (Allomarkgrafia, Macrosiphonia, Mandevilla, Mesechites, Quiotania, and Telosiphonia) formed a distinctive and closely related group. However, in a subsequent revision of the Mexican and Central American species of Mandevilla, J. F. Morales (1998) chose to maintain a strict delimitation of the genus, following the circumscription by R. E. Woodson Jr. (1933).
Recent phylogenetic analyses based on a combination of molecular and morphological characters (A. O. Simões et al. 2004, 2006) have demonstrated that Mandevilla as circumscribed by M. Pichon (1948) is monophyletic while the genus as delimited by R. E. Woodson Jr. (1933) is paraphyletic. Macrosiphonia and Telosiphonia (as well as Quiotania) are nested within Mandevilla and are here included in the genus.
Flowering in the species of Mandevilla from the flora area is sporadic and typically follows rains from May through September.
Several non-native species of Mandevilla, especially the South American M. sanderi (Hemsley) Woodson, are often cultivated as ornamentals in the southern United States.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Flowers 3+ per inflorescence; corolla yellow. | M. foliosa |
1. Flowers solitary or 2 or 3 per inflorescence; corolla white but often ferruginous upon drying. | → 2 |
2. Corolla tube 1–3.5 cm, shorter than to 1.5 times as long as expanded corolla throat. | → 3 |
3. Leaf blades ovate-lanceolate to oblong-ovate, green abaxially and adaxially; peduncles absent or to 1(–3) mm. | M. brachysiphon |
3. Leaf blades linear to oblong-elliptic or oblong-ovate, white-pubescent abaxially, green adaxially; peduncles (5–)12–22(–36) mm. | M. hypoleuca |
2. Corolla tube 4–10 cm, at least 2 times as long as expanded corolla throat. | → 4 |
4. Shrubs; rhizomes absent; petioles mostly shorter than 3 mm. | M. lanuginosa |
4. Suffrutescent perennials; rhizomes present; petioles mostly longer than 3 mm. | M. macrosiphon |
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