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觀察者

arbonius

日期

5月 19, 2023 11:12 PDT

描述

[[NOTE: Three additional (large-sized!) images of this plant (showing more of the flowering stems, and habitus) are available in this companion post on CalPhotos. Check out the "full-size" photos there.

Also, remarks on diagnostic characters (and some descriptive morphology) for Nemacladus morefieldii appear under the this CalPhotos post. ]]

====== Variation in Characters for N. morefieldii======

I'm struck by some of the variation in this (lovely) species.

1) Marginal "chevron" markings on upper three corolla lobes: For instance, note how narrow the reddish "chevrons" of the three upper corolla lobes are in the flowers of the plant here...vs. the much wider marginal chevrons in my CalPhotos post referenced above. Similar variation will be seen upon perusing photos of N. morefieldii on iNaturalist, CalPhotos, and CalFlora.

2) Relative sizes of "flanking" and "central" sepals: Another character that is celebrated for "good" N. morefieldii (i.e. in plants that have taken time to read & comply with the circumscription ;;-) is that the "flanking sepals" (= lateral sepals behind, and angled somewhat below, the lateral petals of the upper lip) are appreciable larger than the "central (upper) sepals" (= those alternating with the uppermost corolla lobe, and positioned behind it's sinuses). Not only are those flanking sepals typically somewhat longer and (especially) wider than the upper sepals...but usually they're also distinctly more "cupped", and cradle the lateral lobes of the upper corolla lip — i.e. more so than the flanking sepals in flowers of the close congener N. orientalis (which, in addirion, has its sepal of more equal size). It's best to have a "from the back" view of a flower to access the relative sizes of the flanking & central sepals...which I didn't get here. But, in the first photo here, one can see that the flanking sepals in the withering flower at left-center are somewhat wider & longer than its central sepals. This is a nice distinctive character...though it does seem to vary quite a bit.

3) Relative size (or even absence?) of "rod-like processes": Finally, I've been wondering how much variation in size (and perhaps even presence?) occurs for the glistening, translucent, "rod-like processes" at the bases of the two adaxial stamens. In the flowers imaged here I can clearly discern the presence of these rods...whereas in my CalPhotos post here they aren't discernible. I know from experience that getting a photo with those rod-like processes in focus can be very difficult...since in most Nemacladus species these rods are exceedingly tiny, and there's very little "depth-of-field leeway" for one's focal plane at the high-magnification required to image them. But still, I'd think that even if focus is a bit off, there'd be at least a blurry intimation (or ghost-image) of the rods? But maybe not? At any rate, perusing photos of N, morefieldii, it seems like in some flowers the rods appear distinctly present, while in others they appear to be absent. It may be worth checking fresh flowers seen in the field with a hand-lens...to see if they have a fairly consistent presence & size for these rods (i.e. if their seemingly random "presence" and "absence" in photos is truly just an artifact of getting photographic focus just right).

I suppose whether the rods are visible might also be subject to phenology? How long does it take for a Nemacladus flower to fully-develop...to open and unfurl its corolla lobes, for its staminal tube attain full length and standard position? Do the rods attain full size in bud, or perhaps continue to grow a bit after the flower opens and as it matures...passing from its "male" anther-dehiscing stage through to its "female" stage of stigma receptivity? And how many days does a given flower remain open during this process? One, two, more?

There are always more questions to ponder with these wonderful plants :-)

====== Pollination Biology in Nemacladus ======

I'm especially curious & eager for us to learn more about which groups of insects are effective pollinators of Nemacladus flowers...and details of the pollination processes that occur & their mechanisms (e.g. Campanulaceae is known for its remarkable secondary pollen presentation structures & mechanisms).

For instance, I'd speculate that species with non-resupinate flowers like N. morefieldii (and N. orientalis, N. montanus, N. interior, etc.) would tend to place pollen on the underside of a visiting insect of the appropriate size (i.e. sternotribic pollen placement). And for resupinate-flowered species, I'd guess pollen placement would more likely be on the upperside of an insect visitor's body (i.e. nototribic). But a priori speculation about pollination processes based on flower morphology has often turned out to be off-the-mark. ;-) Careful direct observation & documention of pollinator visits and behavior (and thoughtful, creative experimentation)...though very time-consuming and laborious...is probably the best avenue for making progress on this front.

I also wonder to what extent (and under what conditions) self-pollination may occur in Nemacladus?

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觀察者

joergmlpts

日期

4月 20, 2023 13:23 PDT

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觀察者

matt_g

日期

4月 2023

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什麼

蒼耳 (Xanthium strumarium)

觀察者

matsonburger

日期

5月 21, 2019 12:28 PDT

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什麼

巨柱仙人掌 (Carnegiea gigantea)

觀察者

tim_mathewson

日期

5月 30, 2022 12:18 MST

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什麼

鹽草 (Distichlis spicata)

觀察者

cabbagefreak

日期

6月 12, 2022 18:09 PDT

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觀察者

flaveboy

日期

10月 30, 2022 10:36 PDT

描述

3 of these growing on kelso dunes - see my other observations

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觀察者

hkibak

日期

11月 1, 2022 15:12 PDT

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觀察者

mdpurdy

日期

7月 2021

描述

Associated with (from same population as) collection Purdy 1141.

Population size estimated at ca. 40 plants. Most vegetative, none in flower, and only 3 in fruit.

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觀察者

matsonburger

日期

6月 2022

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觀察者

wildgifts

日期

6月 18, 2022 12:25 PDT

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什麼

百歲蘭 (Welwitschia mirabilis)

觀察者

joeysantore

日期

5月 11, 2022 18:23 CAT

描述

The only other plant found growing in the immediate vicinity was a succulent shrub species of Amaranthaceae, Arthraerua leubnitziae. Heavy fog in the morning. Ten miles East, no fog. In this way Welwitschia can be seen to be a relictual species somewhat akin to coastal redwoods of California, both clinging to a narrow strip along the coast of a cold ocean where they can find what they need to survive and in the case of Welwitschia, avoid competition.

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觀察者

evolvulux

日期

5月 22, 2021 12:36 MDT

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觀察者

wildgifts

日期

7月 22, 2021 10:00 PDT

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觀察者

walterfertig

日期

6月 2014

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觀察者

madge

日期

4月 10, 2021 11:54 PDT

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觀察者

jrebman

日期

4月 10, 2021 12:08 PDT

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觀察者

rogerstephens

日期

4月 8, 2021 09:09 PDT

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觀察者

swinitsky

日期

5月 2019

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觀察者

efmer

日期

3月 3, 2019 10:02 PST

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什麼

長壽松 (Pinus longaeva)

觀察者

alan_rockefeller

日期

8月 18, 2020 15:11 PDT

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觀察者

matsonburger

日期

5月 2, 2019 10:44 PDT

地點

Lead gulch (Google, OSM)

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觀察者

gentilcore

日期

4月 2018

描述

USA, Nevada, Clark County, Gold Butte National Monumnet: The spectacular yellow Las Vegas Bearpaw Poppy flowers blooming on barren gypsum hills near Little Finland.

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觀察者

micahlauer

日期

6月 7, 2019 09:53 MDT

描述

Growing out of the very top of Delicate Arch... A sea of tourists taking selfies under the most well-known arch in the U.S. and of course I'm drawn to the native plant it's wearing as a hat. ha ha.

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觀察者

ob1963

日期

11月 24, 2013 15:10 PST

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觀察者

sheriff_woody_pct

日期

5月 22, 2020 12:04 PDT

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觀察者

kerinnag

日期

5月 13, 2020 10:39 MST

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觀察者

sheriff_woody_pct

日期

5月 2020

描述

I almost can’t believe it myself, but it has to be this. We just went and saw Lewisia maguirei in the Quinn Canyon Range YESTERDAY. About 150 air miles from this location in the Spring Mountains. About 50 plants. South and west facing limestone slope near top of small ridge. We looked at the sepals of 20 flowers, 19 had 3 sepals and 1 had 4 sepals. Plants had 2-3 flowers per inflorescence. :)!

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觀察者

coreyk

日期

4月 15, 2011 14:53 PDT

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什麼

橡皮金菀木 (Ericameria nauseosa)

觀察者

adrienneleihy

日期

10月 31, 2019 15:37 PDT

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觀察者

sheriff_woody_pct

日期

4月 19, 2020 08:20 PDT

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觀察者

lonnyholmes

日期

4月 11, 2020 12:38 PDT

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什麼

菟絲子屬 ( Cuscuta)

觀察者

sheriff_woody_pct

日期

3月 28, 2020 15:50 PDT

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觀察者

laurenscheinberg

日期

8月 13, 2015 15:10 HST

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什麼

單葉矮松 (Pinus monophylla)

觀察者

ekoberle

日期

12月 28, 2019 07:58 PST

描述

Two separate cones near each other in wash adjacent to Mesquite Spring Campground. Must've traveled quite a great distance to get to this point.

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觀察者

rhjackso

日期

1月 2, 2020 08:34 PST

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什麼

石炭酸灌木 (Larrea tridentata)

觀察者

rhjackso

日期

1月 2, 2020 11:12 PST

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觀察者

naomibot

日期

9月 23, 2018 12:45 PDT

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觀察者

sheliahargis

日期

10月 21, 2017 10:55 CDT

地點

Commons Ford (Google, OSM)

描述

Not sure what is going on but this is the fourth birder that I know of who has had a phoebe perch on their binoculars or on their person at Commons Ford.

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觀察者

coreyjlange

日期

4月 22, 2019 15:52 PDT

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觀察者

micrathene

日期

2月 18, 2019 14:42 MST

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觀察者

walterfertig

日期

6月 2011

描述

Yermo xanthocephalus in flower (note the yellow phyllaries)

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觀察者

storm_petrel

日期

9月 15, 2017 15:46 PDT

描述

Pink family? one of the few hardy plants that grow on the Negit islets

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觀察者

yaelorgad

日期

5月 18, 2018 17:41 IDT

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觀察者

buzzard

日期

3月 2016

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什麼

羚梅 (Purshia tridentata)

觀察者

glmory

日期

7月 31, 2017 14:13 PDT

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什麼

人類 (Homo sapiens)

觀察者

robberfly

日期

7月 25, 2018 12:45 PDT

描述

iNaturalists gather at 10,000 ft. to count Butterflies on White Mountain. l to r: @sea-kangaroo @maractwin @catchang @robberfly @leptonia @storm_petral

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觀察者

carolannie1949

日期

5月 29, 2016 11:33 MDT

描述

These were blooming all over the area above the Dominguez Canyon, bright spots of yellow opening for one day and then dying, ready for another set to bloom tomorrow. They don't have time for fancy smooth petals, so the wrinkled linen look is in.

A beetle resting in the shade of some petals is par for the course!

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觀察者

lonnyholmes

日期

5月 1, 2018 12:25 PDT

描述

ambiguus or thurberi?