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Key to Mentzelia of New Mexico

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Key to Mentzelia of New Mexico Number 48 October 21, 2009 A Newsletter for the flora of New Mexico, from the Identification of Mentzelia Species in New Mexico Range Science Herbarium and Cooperative Extension Service, College of Robert Sivinski Agricultural, Consumer, and New Mexico Forestry Division, P.O. Box 1948, Santa Fe, NM 87504 Environmental Sciences, New Mexico State University. The vernacular names of ‘stickleaf’ and ‘blazingstar’ are appropriate for the genus Mentze- lia (Loasaceae). The glocidiate leaf and stem hairs readily adhere to clothing and the radiating bright white or yellow petals and stamens of most of our species do not open until the late after- noon and evening hours. A child can press a corsage of flowering stickleaf twigs to his or her mother’s blouse and a student of blazingstars must remain late in the field during long summer evenings after everyone else has gone home to dinner. Three sections of the genus Mentzelia occur in New Mexico. Section Trachyphytum is rep- In This Issue — resented by three short-lived, spring or early summer annuals with short (<6 mm) yellow petals. Section Mentzelia in New Mexico is also represented by three species, which have orangish Mentzelia in New flowers that are open during the day. All the remainder, most of our species, are vespertine- Mexico.......................1 flowering, have winged seeds, and belong to the section Bartonia. Section Bartonia appears to Heuchera in New be rapidly diversifying and its species are often not yet well sorted or easily distinguished. They Mexico.......................5 are all highly variable and many exhibit overlapping or intermediate characteristics, which leads to difficulties in taxonomy and identification. SoBeFree The New Mexican blazingstars are still being taxonomically revised by experts and I am Announcement...........6 reluctant to make a premature accounting of them. However, Kelly Allred asked me to construct Plant Distribution a key to the New Mexican Mentzelia taxa, so the following is the taxonomic situation as I cur- Reports.......................7 rently understand it. Botanical Literature...7 A Saving Moss ..........8 Mentzelia in New Mexico (+ = endemic to NM) 1 Seeds lenticular, narrowly winged; open petals white, cream-colored, or yellow and >6 mm long (outer petal surface of closed flower bud often tinged orange) 2 Tap rooted biennials or short-lived perennials (nuda and strictissima) without obvious woody bases; often tall or bushy plants with one or few stems from a rosette of leaves that wither when the plant matures 3 Open petals golden, lemon yellow or sulfur yellow 4 Leaves pinnately lobed to near the midribs (pinnatisect) with slender, linear to linear- oblong lobes that are often more than four times longer than broad 5 Petals <2.5 cm long…M. laciniata (Rydberg) J. Darlington CUTLEAF BLAZINGSTAR. Sandy clay soil in northwestern counties, mostly west of the continental divide. 5 Petals 2.5-4 cm long…+M. conspicua T.K. Todsen CHAMA BLAZINGSTAR. Endemic to sandy clay soil in the Chama River basin of Rio Arriba County. 4 Leaves sinuate, dentate, laciniate or pinnatifid but not with long linear lobes 6 Stem strict, usually >80 cm or more tall with flowering branches mostly above the middle… M. rusbyi Wooton RUSBY’S BLAZINGSTAR. Piñon-juniper woodland and ponderosa forest in the mountains of the central and western regions. 6 Stem(s) branching (often broadly) above and below the middle, rarely >70 cm tall 7 Petals pubescent on outer surface…M. marginata (Osterhout) H.J. Thompson & (Continued on page 2, Mentzelia) Botanice est Scientia Naturalis quae Vegetabilium cognitiorem tradit. — Linnaeus Page 2 (Mentzelia, continued from page 1) 15 Basal leaves usually persistent; stems usually one or Prigge var. cronquistii (H.J. Thompson & Prigge) a few, less than 30 cm tall…+M. perennis Wooton N.H. Holmgren & P.K. Holmgren CRONQUIST‘S WOOTON’S BLAZINGSTAR. Endemic to sandy gyp- BLAZINGSTAR. Desert scrub, San Juan County. sum or caliche soils in the central and south-central 7 Petals glabrous on outer surface regions. 8 Filaments of fertile stamens in outer whorls 15 Basal leaves withering, not persistent; stems usually broadly expanded, sometimes petaloid…M. several, 30-70 cm long …+M. todiltoensis N.D At- multifora (Nuttall) Gray ADONIS BLAZING- wood & S.L. Welsh TODILTO STICKLEAF. Endemic STAR. Distributed state-wide with a bewildering to outcrops of Todilto Gypsum in the central region. array of variations in stature, leaf shape, flower 13 Petals 1.2-2.5 mm wide, white size and shade, and capsule shape and size. 16 Leaves pinnatisect with widely spaced, narrow, linear 8 Filaments of all fertile stamens narrow, outer lobes…M. humilis (Gray) J. Darlington var. humilis whorl filaments only slightly wider than those in GYPSUM BLAZINGSTAR. Gypsum or caliche soils in the inner whorls…M. reverchonii (Urban & Gilg) southeastern region. Thompson & Zavortink RERVERCHON’S BLAZ- 16 Leaves dentate or pinnatisect with broad lobes that are INGSTAR. Northeastern counties near Texas widest at the base…+M. humilis var. guadalupensis border. Spellenberg GUADALUPE STICKLEAF. Endemic to 3 Open petals white or cream-colored outcrops of gypsum on the west slope of the Guada- 9 Petals 5-8 cm long, upper floral bract laciniate, grow- lupe Mountains in Otero County. ing from capsule wall…M. decapetala (Pursh ex Sims) 1 Seeds not lenticular or winged; open petals orange, orange- Urban & Gilg ex Gilg GUMBO LILY. Shaley soil on yellow, or if yellow then <6 mm long eastern plains. 17 Annuals; petals yellow, sometimes with darker red-orange 9 Petals <4 cm long; upper floral bract laciniate or entire, at the base; placentae filiform; leaf blades not hastately subtending the capsule lobed 10 Petals 25-40 mm long; styles 12-25 mm long…M. 18 Inflorescence bracts 2- to 6-toothed, with distinct whit- nuda (Pursh) Torrey & Gray GOODMOTHER. North- ish bases; leaves narrowly lanceolate to nearly linear, eastern plains and canyons. entire or with a few shallow lobes…M. montana 10 Petals <25 mm long; style 7-12 mm long (Davidson) Davidson VARIEGATED-BRACK BLAZING- 11 Stems branching (often broadly) above and below STAR. Foothills and canyons of southwestern and south- the middle, usually <70 cm tall…M. multiflora central mountains. (see lead 7, above). 18 Inflorescence bracts entire or 2-toothed, entirely green 11 Stems strict, usually 70-150 cm or more tall with or with a small whitish patch at the base; leaf blades pin- flowering branches mostly above the middle natifid or entire 19 Leaves often pinnatifid, sometimes with several en- 12 Biennial or more often short-lived perennial tire, narrowly lanceolate leaves; basal leaf rosette usu- with 2 or more stems from the base…M. stric- ally conspicuous…M. albicaulis Douglas ex Hooker tissima (Wooton & Standley) J. Darlington WHITESTEM BLAZINGSTAR Sandy plains and foothills GRASSLAND BLAZINGSTAR. Sandy soils on of western half. southeastern plains. 19 Leaves mostly ovate-lanceolate, entire or shallowly 12 Biennial, usually with a single stem…M. rus- toothed; plants without a distinct basal rosette at matur- byi Wooton (see lead 6 above). ity…M. thompsonii Glad THOMPSON’S STICKLEAF. 2 Perennials with woody caudex branches clothed in persis- Mancos and Fruitland shales, San Juan County. tent leaf bases or a woody multistemmed crown; sometimes 17 Perennial or annual; petals orange or orange-yellow; pla- with persistent basal leaves centae broad; most leaf blades hastately lobed 13 Petals usually 3 mm or more wide, yellow or cream col- 20 Herbaceous annual with slender tap root…M. asperula ored Wooton & Standley ORGAN MOUNTAIN BLAZINGSTAR. 14 Plants bushy with several slender (< 3 mm thick), Rocky slopes of southern mountains. wiry stems; petals and stamens bright lemon yellow; 20 Herbaceous perennial with a semi-woody crown and capsules narrow, more than two times longer than thick roots wide…+M. springeri (Standley) Tidestrom 21 Petals usually <10 mm long; capsules clavate, most SPRINGER’S BLAZINGSTAR. Endemic to volcanic pum- reflexed, with 1-4 seeds…M. oligosperma Nuttall ex ice in piñon-juniper woodland or ponderosa forest in Simms CHICKEN-THIEF. Southern and eastern plains the Jemez Mountains. or rocky slopes. 14 Plants tufted or bushy, but with thicker, stiff stems; 21 Petals usually12-15 mm long; capsules cylindric, petals and stamens sulfur yellow, sometimes fading to erect, with about 10 seeds…M. lindheimeri Urban & cream colored after opening; capsules cup-shaped or Gilg LINDHEIMER’S BLAZINGSTAR. Rocky slopes of broadly cylindric, usually less than two times longer southwestern mountains. than wide (Continued on page 3, Mentzelia) Page 3 (Mentzelia, continued from page 2) The scanty evidence thus far that it may occur in New Mexico is unconvincing and I have not followed the Wooton and Standley The New Mexican species of Mentzelia have recently been (1915) example of including speciosa in the state flora. listed by Allred (2008). I am deviating somewhat from that list Finally, M. lindheimeri and M. montana are extended to and should explain. The Intermountain Flora treatment of southern New Mexico by Christy (1998), but without specimen Mentzelia (Holmgren et al. 2005) has finally circumscribed citations. I cannot find specimens of either one at the UNM her- Mentzelia pumila Nuttall ex Torrey & Gray var. pumila in barium. Mentzelia lindheimeri would probably have been seen enough detail to determine that it does not occur in New Mex- or collected in New Mexico on rocky slopes and canyons in ico. New Mexican specimens identified as pumila are more con- Hidalgo County. Henry Thompson, a Mentzelia expert, has an- sistent with M. multiflora in that the seeds of our plants have the notated three NMC specimens as M. montana. These are: broad wings of multiflora instead of the narrow wings of Wooton s.n. (Organ Mountains, Doña Ana County); Wooton s.n. pumila. Christy (1998) also eliminated the use of pumila in Ari- (near Rio Apache, Catron County); and Metcalfe 51 (Gila River zona in favor of multiflora.
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