Hemi-Parasitic Plants |
Broomrape Family [Orobanchaceae] |
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flower
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petals
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9th June 2008, Humphrey Gate, Taddington, White Peaks. | Photo: © RWD |
A limestone-area pasture-field full of Yellow-Rattle. |
9th June 2008, Humphrey Gate, Taddington, White Peaks. | Photo: © RWD |
Encouraging the growth of Yellow-Rattle in a meadow greatly increases biodiversity because the plant is Hemi-parasitic on grasses and restricts their growth. Some meadows are especially sown with Yellow-Rattle seed for this very purpose. |
9th June 2008, Humphrey Gate, Taddington, White Peaks. | Photo: © RWD |
Ribwort Plantain is the tall plant surrounding Yellow-Rattle, which grows up to 50cm tall. |
31st May 2008, Middlesclough, Broughton In Furness, Cumbria. | Photo: © RWD |
Yellow flowers peep out of a green calyx pod like a cuckoo (or canary, since it is yellow) out of a cuckoo clock. |
31st May 2008, Middlesclough, Broughton In Furness, Cumbria. | Photo: © RWD |
Leaves are oblong to linear, in quadrature pairs opposite each other and attached directly to the single stem without stalks. They have convexly-rounded forwardly-directed bluntish teeth not dissimilar to those of Betony. The topmost leaves look as though they are perfoliate, with the leaf wrapped all around the stem which penetrates the leaf.
Branches may appear in pairs from just above lower leaf-pairs. |
18th June 2019, old dunes, Ainsdale, Sefton Coast. | Photo: © RWD |
The inflorescence is at the top of the spike, below this are just leaves on the lower stalk. |
9th June 2008, Humphrey Gate, Taddington, White Peaks. | Photo: © RWD |
The four pale-green sepals are fused to form an enclosure with just a small opening to accommodate the narrow throat of the flower. The opening has four blunt triangles. Flower is yellow to brownish-yellow with bi-lateral symmetry. The upper lip of the flower is curved, the lower lip drooping slightly. Tellingly, the corolla tube is straight (flower lower right) [and not curving upwards] which indicates it is not Greater Yellow-rattle. |
31st May 2008, Middlesclough, Broughton In Furness, Cumbria. | Photo: © RWD |
Some books state that in Greater Yellow-rattlethe stigma visibly protrudes a short distance, whereas it does not protrude in Yellow-rattle, but the length or visibility of the stigma (or not) does not feature in Clive Stace's ID key for Yellow-rattles. In the above photo the stigmas are visible (and seem to be protruding) in the lower right flower and top flower. (So this non-deterministic feature may well by the reason why Greater Yellow-rattleis over-reported, which it is according to Stace). |
31st May 2008, Middlesclough, Broughton In Furness, Cumbria. | Photo: © RWD |
If the two teeth are wider than they are long, then it is Yellow-rattle. (But if longer than wide, then it is Greater Yellow-rattle). In this specimen, the side-lobes of the three-lobed lower lip (of which only one lobe is clearly visible) seem to be like roundish paddles or dolphins flippers. |
31st May 2008, Middlesclough, Broughton In Furness, Cumbria. | Photo: © RWD |
Some sub-species have short hairs on the calyx (sepals), and on the flowers too. Flower cradled on top of a leaf. |
31st May 2008, Middlesclough, Broughton In Furness, Cumbria. | Photo: © RWD |
Some teeth are white instead of purple. Whatever; The teeth of Yellow Rattle are are broader than they are long (whereas for Greater Yellow-Rattleit is the other way around) [Although quite where you measure it from is another matter in the case of white teeth - with the normally purple teeth that should be easier - see image below] |
23rd May 2008, Shell Island, North Wales. | Photo: © RWD |
The upper lip has a short purple-coloured (or white) tooth slightly protruding. The lower lip has two cuts giving it three lobes, but which are often not clearly visible. |
30th May 2014, arable fields, Downham, Lancs. | Photo: © RWD |
9th June 2008, Humphrey Gate, Taddington, White Peaks. | Photo: © RWD |
From the front, the lower can be more-clearly seen to have three lobes. The two teeth each on side are seen to be narrow on a full frontal view. Note too the very short glandular hairs which are on the 'canaries body'. |
2nd July 2015, Ainsdale Dunes, Sefton Coast. | Photo: © RWD |
The stamens (brown) and style (green, top) are deep within the beak of the 'canary'. |
18th June 2019, old dunes, Ainsdale, Sefton Coast. | Photo: © RWD |
The 'mouth' from below showing the many short stamens in two rows and the green discoidal stigma just below the 'beak' of the 'canary'. |
8th July 2014, dune slacks, Ainsdale, Sefton Coast, Ainsdale | Photo: © RWD |
The seed pods (calyx) are maximally inflated when the seeds are ripe. |
8th July 2014, dune slacks, Ainsdale, Sefton Coast, Ainsdale | Photo: © RWD |
The calyx, when the seeds are rip, turns purple-brown and is cupped by a short, coarsely-toothed, leaf/bract(?) on short stalks. |
2nd July 2015, Ainsdale Dunes, Sefton Coast. | Photo: © RWD |
The two sepals of the calyx peel back to reveal a nearly round seed-pod with a short point at the tip. |
2nd July 2015, Ainsdale Dunes, Sefton Coast. | Photo: © RWD |
Within the seed pod are over numerous discoidal seeds usually possessing a marginal flange (wing), three of which your Author has squeezed out after breaking the seed-pod. Your Author supposes that it is the seeds within the seed-pod (and not the seed-pod within the calyx) which rattle when ripe and shaken. This calyx contained 2 seed-pods, your Author does not know if that is typical, or not. |
30th May 2014, arable fields, Downham, Lancs. | Photo: © RWD |
Some specimens have two side-branches which emerge just above a pair of leaves. |
30th May 2014, arable fields, Downham, Lancs. | Photo: © RWD |
The stems are flecked with purplish-brown streaks. |
Some similarities to : There are reportedly six sub-species of Yellow-Rattle, differentiating between them is best left to experts with more patience but it will likely just drive them round the bend.
Slight resemblance to : A canary clambering out of an eggshell, with its mouth agape.
Many similarities to
Uniquely identifiable characteristics: Apart from much rarer (RRR) Distinguishing Feature : looks like a canary emerging from its eggshell with mouth agape. This is a Hemi-parasitic plant, meaning that it relies on obtaining some of its nutrients from the roots of nearby plants. The flowers themselves have a beaked appearance that resembles those of Red Bartsia which is another hemi-parasite but the flowers of Yellow-Rattle are larger. One of the effects of its parasitic nature is that it reduces the abundance of grasses by suppressing their growth. Yellow-Rattle derives its name from the loose seeds within which rattle around in their pods when ripe. The scientific name 'Rhinanthus' is a flower that looks similar to a nose. It is highly variable in several characteristics and exhibits ecotypic variation; that is variation due to the ecology of its immediate surroundings. There are six reported sub-species of Yellow-Rattle, those shown in the above photographs could be any number of them, most are either rare [RR], or very rare [RRR]. But most are more likely to be the species which is not in any way rare, that of Rhinanthus minor ssp. minor.
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Rhinanthus | minor | ⇐ Global Aspect ⇒ | Orobanchaceae |
Rhinanthus (Yellow-rattles) |
Broomrape Family [Orobanchaceae] |